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fix(deps): update dependency @openzeppelin/contracts to v4 [security] - autoclosed #1033

Closed renovate[bot] closed 3 months ago

renovate[bot] commented 10 months ago

Mend Renovate

This PR contains the following updates:

Package Change Age Adoption Passing Confidence
@openzeppelin/contracts (source) ~3.4.2 -> ~4.8.0 age adoption passing confidence
@openzeppelin/contracts (source) ^3.4.2 -> ^4.0.0 age adoption passing confidence

GitHub Vulnerability Alerts

CVE-2023-30541

Impact

A function in the implementation contract may be inaccessible if its selector clashes with one of the proxy's own selectors. Specifically, if the clashing function has a different signature with incompatible ABI encoding, the proxy could revert while attempting to decode the arguments from calldata.

The probability of an accidental clash is negligible, but one could be caused deliberately.

Patches

The issue has been fixed in v4.8.3.

Workarounds

If a function appears to be inaccessible for this reason, it may be possible to craft the calldata such that ABI decoding does not fail at the proxy and the function is properly proxied through.

References

https://github.com/OpenZeppelin/openzeppelin-contracts/pull/4154

Improper Initialization in OpenZeppelin

CVE-2021-46320 / CVE-2022-39384 / GHSA-88g8-f5mf-f5rj / GHSA-9c22-pwxw-p6hx

More information #### Details In OpenZeppelin <=v4.4.0, initializer functions that are invoked separate from contract creation (the most prominent example being minimal proxies) may be reentered if they make an untrusted non-view external call. Once an initializer has finished running it can never be re-executed. However, an exception put in place to support multiple inheritance made reentrancy possible, breaking the expectation that there is a single execution. #### Severity - CVSS Score: 7.5 / 10 (High) - Vector String: `CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N` #### References - [https://github.com/OpenZeppelin/openzeppelin-contracts/security/advisories/GHSA-9c22-pwxw-p6hx](https://togithub.com/OpenZeppelin/openzeppelin-contracts/security/advisories/GHSA-9c22-pwxw-p6hx) - [https://nvd.nist.gov/vuln/detail/CVE-2021-46320](https://nvd.nist.gov/vuln/detail/CVE-2021-46320) - [https://github.com/OpenZeppelin/openzeppelin-contracts/pull/3006](https://togithub.com/OpenZeppelin/openzeppelin-contracts/pull/3006) - [https://github.com/OpenZeppelin/openzeppelin-contracts](https://togithub.com/OpenZeppelin/openzeppelin-contracts) - [https://github.com/OpenZeppelin/openzeppelin-contracts/releases/tag/v4.4.1](https://togithub.com/OpenZeppelin/openzeppelin-contracts/releases/tag/v4.4.1) This data is provided by [OSV](https://osv.dev/vulnerability/GHSA-88g8-f5mf-f5rj) and the [GitHub Advisory Database](https://togithub.com/github/advisory-database) ([CC-BY 4.0](https://togithub.com/github/advisory-database/blob/main/LICENSE.md)).

OpenZeppelin Contracts initializer reentrancy may lead to double initialization

CVE-2021-46320 / CVE-2022-39384 / GHSA-88g8-f5mf-f5rj / GHSA-9c22-pwxw-p6hx

More information #### Details ##### Impact Initializer functions that are invoked separate from contract creation (the most prominent example being minimal proxies) may be reentered if they make an untrusted non-view external call. Once an initializer has finished running it can never be re-executed. However, an exception put in place to support multiple inheritance made reentrancy possible in the scenario described above, breaking the expectation that there is a single execution. Note that upgradeable proxies are commonly initialized together with contract creation, where reentrancy is not feasible, so the impact of this issue is believed to be minor. ##### Patches A fix is included in the version v4.4.1 of `@openzeppelin/contracts` and `@openzeppelin/contracts-upgradeable`. ##### Workarounds Avoid untrusted external calls during initialization. ##### References [https://github.com/OpenZeppelin/openzeppelin-contracts/pull/3006](https://togithub.com/OpenZeppelin/openzeppelin-contracts/pull/3006) ##### Credits This issue was identified and reported by @​chaitinblockchain through [our bug bounty on Immunefi](https://immunefi.com/bounty/openzeppelin/). ##### For more information If you have any questions or comments about this advisory, or need assistance executing the mitigation, email us at security@openzeppelin.com. #### Severity - CVSS Score: 5.6 / 10 (Medium) - Vector String: `CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:L` #### References - [https://github.com/OpenZeppelin/openzeppelin-contracts/security/advisories/GHSA-9c22-pwxw-p6hx](https://togithub.com/OpenZeppelin/openzeppelin-contracts/security/advisories/GHSA-9c22-pwxw-p6hx) - [https://nvd.nist.gov/vuln/detail/CVE-2022-39384](https://nvd.nist.gov/vuln/detail/CVE-2022-39384) - [https://github.com/OpenZeppelin/openzeppelin-contracts/pull/3006](https://togithub.com/OpenZeppelin/openzeppelin-contracts/pull/3006) - [https://github.com/OpenZeppelin/openzeppelin-contracts](https://togithub.com/OpenZeppelin/openzeppelin-contracts) This data is provided by [OSV](https://osv.dev/vulnerability/GHSA-9c22-pwxw-p6hx) and the [GitHub Advisory Database](https://togithub.com/github/advisory-database) ([CC-BY 4.0](https://togithub.com/github/advisory-database/blob/main/LICENSE.md)).

OpenZeppelin Contracts ERC165Checker unbounded gas consumption

CVE-2022-35915 / GHSA-7grf-83vw-6f5x

More information #### Details ##### Impact The target contract of an EIP-165 `supportsInterface` query can cause unbounded gas consumption by returning a lot of data, while it is generally assumed that this operation has a bounded cost. ##### Patches The issue has been fixed in v4.7.2. ##### References [https://github.com/OpenZeppelin/openzeppelin-contracts/pull/3587](https://togithub.com/OpenZeppelin/openzeppelin-contracts/pull/3587) ##### For more information If you have any questions or comments about this advisory, or need assistance deploying a fix, email us at [security@openzeppelin.com](mailto:security@openzeppelin.com). #### Severity - CVSS Score: 5.3 / 10 (Medium) - Vector String: `CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L` #### References - [https://github.com/OpenZeppelin/openzeppelin-contracts/security/advisories/GHSA-7grf-83vw-6f5x](https://togithub.com/OpenZeppelin/openzeppelin-contracts/security/advisories/GHSA-7grf-83vw-6f5x) - [https://nvd.nist.gov/vuln/detail/CVE-2022-35915](https://nvd.nist.gov/vuln/detail/CVE-2022-35915) - [https://github.com/OpenZeppelin/openzeppelin-contracts/pull/3587](https://togithub.com/OpenZeppelin/openzeppelin-contracts/pull/3587) - [https://github.com/OpenZeppelin/openzeppelin-contracts](https://togithub.com/OpenZeppelin/openzeppelin-contracts) - [https://github.com/OpenZeppelin/openzeppelin-contracts/releases/tag/v4.7.2](https://togithub.com/OpenZeppelin/openzeppelin-contracts/releases/tag/v4.7.2) This data is provided by [OSV](https://osv.dev/vulnerability/GHSA-7grf-83vw-6f5x) and the [GitHub Advisory Database](https://togithub.com/github/advisory-database) ([CC-BY 4.0](https://togithub.com/github/advisory-database/blob/main/LICENSE.md)).

OpenZeppelin Contracts TransparentUpgradeableProxy clashing selector calls may not be delegated

CVE-2023-30541 / GHSA-mx2q-35m2-x2rh

More information #### Details ##### Impact A function in the implementation contract may be inaccessible if its selector clashes with one of the proxy's own selectors. Specifically, if the clashing function has a different signature with incompatible ABI encoding, the proxy could revert while attempting to decode the arguments from calldata. The probability of an accidental clash is negligible, but one could be caused deliberately. ##### Patches The issue has been fixed in v4.8.3. ##### Workarounds If a function appears to be inaccessible for this reason, it may be possible to craft the calldata such that ABI decoding does not fail at the proxy and the function is properly proxied through. ##### References [https://github.com/OpenZeppelin/openzeppelin-contracts/pull/4154](https://togithub.com/OpenZeppelin/openzeppelin-contracts/pull/4154) #### Severity - CVSS Score: 5.3 / 10 (Medium) - Vector String: `CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L` #### References - [https://github.com/OpenZeppelin/openzeppelin-contracts/security/advisories/GHSA-mx2q-35m2-x2rh](https://togithub.com/OpenZeppelin/openzeppelin-contracts/security/advisories/GHSA-mx2q-35m2-x2rh) - [https://nvd.nist.gov/vuln/detail/CVE-2023-30541](https://nvd.nist.gov/vuln/detail/CVE-2023-30541) - [https://github.com/OpenZeppelin/openzeppelin-contracts/pull/4154](https://togithub.com/OpenZeppelin/openzeppelin-contracts/pull/4154) - [https://github.com/OpenZeppelin/openzeppelin-contracts-upgradeable/commit/58fa0f81c4036f1a3b616fdffad2fd27e5d5ce21](https://togithub.com/OpenZeppelin/openzeppelin-contracts-upgradeable/commit/58fa0f81c4036f1a3b616fdffad2fd27e5d5ce21) - [https://github.com/OpenZeppelin/openzeppelin-contracts](https://togithub.com/OpenZeppelin/openzeppelin-contracts) - [https://github.com/OpenZeppelin/openzeppelin-contracts/releases/tag/v4.8.3](https://togithub.com/OpenZeppelin/openzeppelin-contracts/releases/tag/v4.8.3) This data is provided by [OSV](https://osv.dev/vulnerability/GHSA-mx2q-35m2-x2rh) and the [GitHub Advisory Database](https://togithub.com/github/advisory-database) ([CC-BY 4.0](https://togithub.com/github/advisory-database/blob/main/LICENSE.md)).

Release Notes

OpenZeppelin/openzeppelin-contracts (@​openzeppelin/contracts) ### [`v4.8.3`](https://togithub.com/OpenZeppelin/openzeppelin-contracts/blob/HEAD/CHANGELOG.md#483-2023-04-13) [Compare Source](https://togithub.com/OpenZeppelin/openzeppelin-contracts/compare/v4.8.2...v4.8.3) - `GovernorCompatibilityBravo`: Fix encoding of proposal data when signatures are missing. - `TransparentUpgradeableProxy`: Fix transparency in case of selector clash with non-decodable calldata or payable mutability. ([#​4154](https://togithub.com/OpenZeppelin/openzeppelin-contracts/pull/4154)) ### [`v4.8.2`](https://togithub.com/OpenZeppelin/openzeppelin-contracts/blob/HEAD/CHANGELOG.md#482-2023-03-02) [Compare Source](https://togithub.com/OpenZeppelin/openzeppelin-contracts/compare/v4.8.1...v4.8.2) - `ERC721Consecutive`: Fixed a bug when `_mintConsecutive` is used for batches of size 1 that could lead to balance overflow. Refer to the breaking changes section in the changelog for a note on the behavior of `ERC721._beforeTokenTransfer`. ##### Breaking changes - `ERC721`: The internal function `_beforeTokenTransfer` no longer updates balances, which it previously did when `batchSize` was greater than 1. This change has no consequence unless a custom ERC721 extension is explicitly invoking `_beforeTokenTransfer`. Balance updates in extensions must now be done explicitly using `__unsafe_increaseBalance`, with a name that indicates that there is an invariant that has to be manually verified. ### [`v4.8.1`](https://togithub.com/OpenZeppelin/openzeppelin-contracts/blob/HEAD/CHANGELOG.md#481-2023-01-12) [Compare Source](https://togithub.com/OpenZeppelin/openzeppelin-contracts/compare/v4.8.0...v4.8.1) - `ERC4626`: Use staticcall instead of call when fetching underlying ERC-20 decimals. ([#​3943](https://togithub.com/OpenZeppelin/openzeppelin-contracts/pull/3943)) ### [`v4.8.0`](https://togithub.com/OpenZeppelin/openzeppelin-contracts/blob/HEAD/CHANGELOG.md#480-2022-11-08) [Compare Source](https://togithub.com/OpenZeppelin/openzeppelin-contracts/compare/v4.7.3...v4.8.0) - `TimelockController`: Added a new `admin` constructor parameter that is assigned the admin role instead of the deployer account. ([#​3722](https://togithub.com/OpenZeppelin/openzeppelin-contracts/pull/3722)) - `Initializable`: add internal functions `_getInitializedVersion` and `_isInitializing` ([#​3598](https://togithub.com/OpenZeppelin/openzeppelin-contracts/pull/3598)) - `ERC165Checker`: add `supportsERC165InterfaceUnchecked` for consulting individual interfaces without the full ERC165 protocol. ([#​3339](https://togithub.com/OpenZeppelin/openzeppelin-contracts/pull/3339)) - `Address`: optimize `functionCall` by calling `functionCallWithValue` directly. ([#​3468](https://togithub.com/OpenZeppelin/openzeppelin-contracts/pull/3468)) - `Address`: optimize `functionCall` functions by checking contract size only if there is no returned data. ([#​3469](https://togithub.com/OpenZeppelin/openzeppelin-contracts/pull/3469)) - `Governor`: make the `relay` function payable, and add support for EOA payments. ([#​3730](https://togithub.com/OpenZeppelin/openzeppelin-contracts/pull/3730)) - `GovernorCompatibilityBravo`: remove unused `using` statements. ([#​3506](https://togithub.com/OpenZeppelin/openzeppelin-contracts/pull/3506)) - `ERC20`: optimize `_transfer`, `_mint` and `_burn` by using `unchecked` arithmetic when possible. ([#​3513](https://togithub.com/OpenZeppelin/openzeppelin-contracts/pull/3513)) - `ERC20Votes`, `ERC721Votes`: optimize `getPastVotes` for looking up recent checkpoints. ([#​3673](https://togithub.com/OpenZeppelin/openzeppelin-contracts/pull/3673)) - `ERC20FlashMint`: add an internal `_flashFee` function for overriding. ([#​3551](https://togithub.com/OpenZeppelin/openzeppelin-contracts/pull/3551)) - `ERC4626`: use the same `decimals()` as the underlying asset by default (if available). ([#​3639](https://togithub.com/OpenZeppelin/openzeppelin-contracts/pull/3639)) - `ERC4626`: add internal `_initialConvertToShares` and `_initialConvertToAssets` functions to customize empty vaults behavior. ([#​3639](https://togithub.com/OpenZeppelin/openzeppelin-contracts/pull/3639)) - `ERC721`: optimize transfers by making approval clearing implicit instead of emitting an event. ([#​3481](https://togithub.com/OpenZeppelin/openzeppelin-contracts/pull/3481)) - `ERC721`: optimize burn by making approval clearing implicit instead of emitting an event. ([#​3538](https://togithub.com/OpenZeppelin/openzeppelin-contracts/pull/3538)) - `ERC721`: Fix balance accounting when a custom `_beforeTokenTransfer` hook results in a transfer of the token under consideration. ([#​3611](https://togithub.com/OpenZeppelin/openzeppelin-contracts/pull/3611)) - `ERC721`: use unchecked arithmetic for balance updates. ([#​3524](https://togithub.com/OpenZeppelin/openzeppelin-contracts/pull/3524)) - `ERC721Consecutive`: Implementation of EIP-2309 that allows batch minting of ERC721 tokens during construction. ([#​3311](https://togithub.com/OpenZeppelin/openzeppelin-contracts/pull/3311)) - `ReentrancyGuard`: Reduce code size impact of the modifier by using internal functions. ([#​3515](https://togithub.com/OpenZeppelin/openzeppelin-contracts/pull/3515)) - `SafeCast`: optimize downcasting of signed integers. ([#​3565](https://togithub.com/OpenZeppelin/openzeppelin-contracts/pull/3565)) - `ECDSA`: Remove redundant check on the `v` value. ([#​3591](https://togithub.com/OpenZeppelin/openzeppelin-contracts/pull/3591)) - `VestingWallet`: add `releasable` getters. ([#​3580](https://togithub.com/OpenZeppelin/openzeppelin-contracts/pull/3580)) - `VestingWallet`: remove unused library `Math.sol`. ([#​3605](https://togithub.com/OpenZeppelin/openzeppelin-contracts/pull/3605)) - `VestingWallet`: make constructor payable. ([#​3665](https://togithub.com/OpenZeppelin/openzeppelin-contracts/pull/3665)) - `Create2`: optimize address computation by using assembly instead of `abi.encodePacked`. ([#​3600](https://togithub.com/OpenZeppelin/openzeppelin-contracts/pull/3600)) - `Clones`: optimized the assembly to use only the scratch space during deployments, and optimized `predictDeterministicAddress` to use fewer operations. ([#​3640](https://togithub.com/OpenZeppelin/openzeppelin-contracts/pull/3640)) - `Checkpoints`: Use procedural generation to support multiple key/value lengths. ([#​3589](https://togithub.com/OpenZeppelin/openzeppelin-contracts/pull/3589)) - `Checkpoints`: Add new lookup mechanisms. ([#​3589](https://togithub.com/OpenZeppelin/openzeppelin-contracts/pull/3589)) - `Arrays`: Add `unsafeAccess` functions that allow reading and writing to an element in a storage array bypassing Solidity's "out-of-bounds" check. ([#​3589](https://togithub.com/OpenZeppelin/openzeppelin-contracts/pull/3589)) - `Strings`: optimize `toString`. ([#​3573](https://togithub.com/OpenZeppelin/openzeppelin-contracts/pull/3573)) - `Ownable2Step`: extension of `Ownable` that makes the ownership transfers a two step process. ([#​3620](https://togithub.com/OpenZeppelin/openzeppelin-contracts/pull/3620)) - `Math` and `SignedMath`: optimize function `max` by using `>` instead of `>=`. ([#​3679](https://togithub.com/OpenZeppelin/openzeppelin-contracts/pull/3679)) - `Math`: Add `log2`, `log10` and `log256`. ([#​3670](https://togithub.com/OpenZeppelin/openzeppelin-contracts/pull/3670)) - Arbitrum: Update the vendored arbitrum contracts to match the nitro upgrade. ([#​3692](https://togithub.com/OpenZeppelin/openzeppelin-contracts/pull/3692)) ##### Breaking changes - `ERC721`: In order to add support for batch minting via `ERC721Consecutive` it was necessary to make a minor breaking change in the internal interface of `ERC721`. Namely, the hooks `_beforeTokenTransfer` and `_afterTokenTransfer` have one additional argument that may need to be added to overrides: ```diff function _beforeTokenTransfer( address from, address to, uint256 tokenId, + uint256 batchSize ) internal virtual override ``` - `ERC4626`: Conversion from shares to assets (and vice-versa) in an empty vault used to consider the possible mismatch between the underlying asset's and the vault's decimals. This initial conversion rate is now set to 1-to-1 irrespective of decimals, which are meant for usability purposes only. The vault now uses the assets decimals by default, so off-chain the numbers should appear the same. Developers overriding the vault decimals to a value that does not match the underlying asset may want to override the `_initialConvertToShares` and `_initialConvertToAssets` to replicate the previous behavior. - `TimelockController`: During deployment, the TimelockController used to grant the `TIMELOCK_ADMIN_ROLE` to the deployer and to the timelock itself. The deployer was then expected to renounce this role once configuration of the timelock is over. Failing to renounce that role allows the deployer to change the timelock permissions (but not to bypass the delay for any time-locked actions). The role is no longer given to the deployer by default. A new parameter `admin` can be set to a non-zero address to grant the admin role during construction (to the deployer or any other address). Just like previously, this admin role should be renounced after configuration. If this param is given `address(0)`, the role is not allocated and doesn't need to be revoked. In any case, the timelock itself continues to have this role. ##### Deprecations - `EIP712`: Added the file `EIP712.sol` and deprecated `draft-EIP712.sol` since the EIP is no longer a Draft. Developers are encouraged to update their imports. ([#​3621](https://togithub.com/OpenZeppelin/openzeppelin-contracts/pull/3621)) ```diff -import "@​openzeppelin/contracts/utils/cryptography/draft-EIP712.sol"; +import "@​openzeppelin/contracts/utils/cryptography/EIP712.sol"; ``` - `ERC721Votes`: Added the file `ERC721Votes.sol` and deprecated `draft-ERC721Votes.sol` since it no longer depends on a Draft EIP (EIP-712). Developers are encouraged to update their imports. ([#​3699](https://togithub.com/OpenZeppelin/openzeppelin-contracts/pull/3699)) ```diff -import "@​openzeppelin/contracts/token/ERC721/extensions/draft-ERC721Votes.sol"; +import "@​openzeppelin/contracts/token/ERC721/extensions/ERC721Votes.sol"; ``` ##### ERC-721 Compatibility Note ERC-721 integrators that interpret contract state from events should make sure that they implement the clearing of approval that is implicit in every transfer according to the EIP. Previous versions of OpenZeppelin Contracts emitted an explicit `Approval` event even though it was not required by the specification, and this is no longer the case. With the new `ERC721Consecutive` extension, the internal workings of `ERC721` are slightly changed. Custom extensions to ERC721 should be reviewed to ensure they remain correct. The internal functions that should be considered are `_ownerOf` (new), `_beforeTokenTransfer`, and `_afterTokenTransfer`. ##### ERC-4626 Upgrade Note Existing `ERC4626` contracts that are upgraded to 4.8 must initialize a new variable that holds the vault token decimals. The recommended way to do this is to use a [reinitializer]: [reinitializer]: https://docs.openzeppelin.com/contracts/4.x/api/proxy#Initializable-reinitializer-uint8- ```solidity function migrateToV48() public reinitializer(2) { __ERC4626_init(IERC20Upgradeable(asset())); } ``` ### [`v4.7.3`](https://togithub.com/OpenZeppelin/openzeppelin-contracts/blob/HEAD/CHANGELOG.md#473-2022-08-10) [Compare Source](https://togithub.com/OpenZeppelin/openzeppelin-contracts/compare/v4.7.2...v4.7.3) ##### Breaking changes - `ECDSA`: `recover(bytes32,bytes)` and `tryRecover(bytes32,bytes)` no longer accept compact signatures to prevent malleability. Compact signature support remains available using `recover(bytes32,bytes32,bytes32)` and `tryRecover(bytes32,bytes32,bytes32)`. ### [`v4.7.2`](https://togithub.com/OpenZeppelin/openzeppelin-contracts/blob/HEAD/CHANGELOG.md#472-2022-07-25) [Compare Source](https://togithub.com/OpenZeppelin/openzeppelin-contracts/compare/v4.7.1...v4.7.2) - `LibArbitrumL2`, `CrossChainEnabledArbitrumL2`: Fixed detection of cross-chain calls for EOAs. Previously, calls from EOAs would be classified as cross-chain calls. ([#​3578](https://togithub.com/OpenZeppelin/openzeppelin-contracts/pull/3578)) - `GovernorVotesQuorumFraction`: Fixed quorum updates so they do not affect past proposals that failed due to lack of quorum. ([#​3561](https://togithub.com/OpenZeppelin/openzeppelin-contracts/pull/3561)) - `ERC165Checker`: Added protection against large returndata. ([#​3587](https://togithub.com/OpenZeppelin/openzeppelin-contracts/pull/3587)) ### [`v4.7.1`](https://togithub.com/OpenZeppelin/openzeppelin-contracts/blob/HEAD/CHANGELOG.md#471-2022-07-18) [Compare Source](https://togithub.com/OpenZeppelin/openzeppelin-contracts/compare/v4.7.0...v4.7.1) - `SignatureChecker`: Fix an issue that causes `isValidSignatureNow` to revert when the target contract returns ill-encoded data. ([#​3552](https://togithub.com/OpenZeppelin/openzeppelin-contracts/pull/3552)) - `ERC165Checker`: Fix an issue that causes `supportsInterface` to revert when the target contract returns ill-encoded data. ([#​3552](https://togithub.com/OpenZeppelin/openzeppelin-contracts/pull/3552)) ### [`v4.7.0`](https://togithub.com/OpenZeppelin/openzeppelin-contracts/blob/HEAD/CHANGELOG.md#470-2022-06-29) [Compare Source](https://togithub.com/OpenZeppelin/openzeppelin-contracts/compare/v4.6.0...v4.7.0) - `TimelockController`: Migrate `_call` to `_execute` and allow inheritance and overriding similar to `Governor`. ([#​3317](https://togithub.com/OpenZeppelin/openzeppelin-contracts/pull/3317)) - `CrossChainEnabledPolygonChild`: replace the `require` statement with the custom error `NotCrossChainCall`. ([#​3380](https://togithub.com/OpenZeppelin/openzeppelin-contracts/pull/3380)) - `ERC20FlashMint`: Add customizable flash fee receiver. ([#​3327](https://togithub.com/OpenZeppelin/openzeppelin-contracts/pull/3327)) - `ERC4626`: add an extension of `ERC20` that implements the ERC4626 Tokenized Vault Standard. ([#​3171](https://togithub.com/OpenZeppelin/openzeppelin-contracts/pull/3171)) - `SafeERC20`: add `safePermit` as mitigation against phantom permit functions. ([#​3280](https://togithub.com/OpenZeppelin/openzeppelin-contracts/pull/3280)) - `Math`: add a `mulDiv` function that can round the result either up or down. ([#​3171](https://togithub.com/OpenZeppelin/openzeppelin-contracts/pull/3171)) - `Math`: Add a `sqrt` function to compute square roots of integers, rounding either up or down. ([#​3242](https://togithub.com/OpenZeppelin/openzeppelin-contracts/pull/3242)) - `Strings`: add a new overloaded function `toHexString` that converts an `address` with fixed length of 20 bytes to its not checksummed ASCII `string` hexadecimal representation. ([#​3403](https://togithub.com/OpenZeppelin/openzeppelin-contracts/pull/3403)) - `EnumerableMap`: add new `UintToUintMap` map type. ([#​3338](https://togithub.com/OpenZeppelin/openzeppelin-contracts/pull/3338)) - `EnumerableMap`: add new `Bytes32ToUintMap` map type. ([#​3416](https://togithub.com/OpenZeppelin/openzeppelin-contracts/pull/3416)) - `SafeCast`: add support for many more types, using procedural code generation. ([#​3245](https://togithub.com/OpenZeppelin/openzeppelin-contracts/pull/3245)) - `MerkleProof`: add `multiProofVerify` to prove multiple values are part of a Merkle tree. ([#​3276](https://togithub.com/OpenZeppelin/openzeppelin-contracts/pull/3276)) - `MerkleProof`: add calldata versions of the functions to avoid copying input arrays to memory and save gas. ([#​3200](https://togithub.com/OpenZeppelin/openzeppelin-contracts/pull/3200)) - `ERC721`, `ERC1155`: simplified revert reasons. ([#​3254](https://togithub.com/OpenZeppelin/openzeppelin-contracts/pull/3254), ([#​3438](https://togithub.com/OpenZeppelin/openzeppelin-contracts/pull/3438))) - `ERC721`: removed redundant require statement. ([#​3434](https://togithub.com/OpenZeppelin/openzeppelin-contracts/pull/3434)) - `PaymentSplitter`: add `releasable` getters. ([#​3350](https://togithub.com/OpenZeppelin/openzeppelin-contracts/pull/3350)) - `Initializable`: refactored implementation of modifiers for easier understanding. ([#​3450](https://togithub.com/OpenZeppelin/openzeppelin-contracts/pull/3450)) - `Proxies`: remove runtime check of ERC1967 storage slots. ([#​3455](https://togithub.com/OpenZeppelin/openzeppelin-contracts/pull/3455)) ##### Breaking changes - `Initializable`: functions decorated with the modifier `reinitializer(1)` may no longer invoke each other. ### [`v4.6.0`](https://togithub.com/OpenZeppelin/openzeppelin-contracts/blob/HEAD/CHANGELOG.md#460-2022-04-26) [Compare Source](https://togithub.com/OpenZeppelin/openzeppelin-contracts/compare/v4.5.0...v4.6.0) - `crosschain`: Add a new set of contracts for cross-chain applications. `CrossChainEnabled` is a base contract with instantiations for several chains and bridges, and `AccessControlCrossChain` is an extension of access control that allows cross-chain operation. ([#​3183](https://togithub.com/OpenZeppelin/openzeppelin-contracts/pull/3183)) - `AccessControl`: add a virtual `_checkRole(bytes32)` function that can be overridden to alter the `onlyRole` modifier behavior. ([#​3137](https://togithub.com/OpenZeppelin/openzeppelin-contracts/pull/3137)) - `EnumerableMap`: add new `AddressToUintMap` map type. ([#​3150](https://togithub.com/OpenZeppelin/openzeppelin-contracts/pull/3150)) - `EnumerableMap`: add new `Bytes32ToBytes32Map` map type. ([#​3192](https://togithub.com/OpenZeppelin/openzeppelin-contracts/pull/3192)) - `ERC20FlashMint`: support infinite allowance when paying back a flash loan. ([#​3226](https://togithub.com/OpenZeppelin/openzeppelin-contracts/pull/3226)) - `ERC20Wrapper`: the `decimals()` function now tries to fetch the value from the underlying token instance. If that calls revert, then the default value is used. ([#​3259](https://togithub.com/OpenZeppelin/openzeppelin-contracts/pull/3259)) - `draft-ERC20Permit`: replace `immutable` with `constant` for `_PERMIT_TYPEHASH` since the `keccak256` of string literals is treated specially and the hash is evaluated at compile time. ([#​3196](https://togithub.com/OpenZeppelin/openzeppelin-contracts/pull/3196)) - `ERC1155`: Add a `_afterTokenTransfer` hook for improved extensibility. ([#​3166](https://togithub.com/OpenZeppelin/openzeppelin-contracts/pull/3166)) - `ERC1155URIStorage`: add a new extension that implements a `_setURI` behavior similar to ERC721's `_setTokenURI`. ([#​3210](https://togithub.com/OpenZeppelin/openzeppelin-contracts/pull/3210)) - `DoubleEndedQueue`: a new data structure that supports efficient push and pop to both front and back, useful for FIFO and LIFO queues. ([#​3153](https://togithub.com/OpenZeppelin/openzeppelin-contracts/pull/3153)) - `Governor`: improved security of `onlyGovernance` modifier when using an external executor contract (e.g. a timelock) that can operate without necessarily going through the governance protocol. ([#​3147](https://togithub.com/OpenZeppelin/openzeppelin-contracts/pull/3147)) - `Governor`: Add a way to parameterize votes. This can be used to implement voting systems such as fractionalized voting, ERC721 based voting, or any number of other systems. The `params` argument added to `_countVote` method, and included in the newly added `_getVotes` method, can be used by counting and voting modules respectively for such purposes. ([#​3043](https://togithub.com/OpenZeppelin/openzeppelin-contracts/pull/3043)) - `Governor`: rewording of revert reason for consistency. ([#​3275](https://togithub.com/OpenZeppelin/openzeppelin-contracts/pull/3275)) - `Governor`: fix an inconsistency in data locations that could lead to invalid bytecode being produced. ([#​3295](https://togithub.com/OpenZeppelin/openzeppelin-contracts/pull/3295)) - `Governor`: Implement `IERC721Receiver` and `IERC1155Receiver` to improve token custody by governors. ([#​3230](https://togithub.com/OpenZeppelin/openzeppelin-contracts/pull/3230)) - `TimelockController`: Implement `IERC721Receiver` and `IERC1155Receiver` to improve token custody by timelocks. ([#​3230](https://togithub.com/OpenZeppelin/openzeppelin-contracts/pull/3230)) - `TimelockController`: Add a separate canceller role for the ability to cancel. ([#​3165](https://togithub.com/OpenZeppelin/openzeppelin-contracts/pull/3165)) - `Initializable`: add a reinitializer modifier that enables the initialization of new modules, added to already initialized contracts through upgradeability. ([#​3232](https://togithub.com/OpenZeppelin/openzeppelin-contracts/pull/3232)) - `Initializable`: add an Initialized event that tracks initialized version numbers. ([#​3294](https://togithub.com/OpenZeppelin/openzeppelin-contracts/pull/3294)) - `ERC2981`: make `royaltyInfo` public to allow super call in overrides. ([#​3305](https://togithub.com/OpenZeppelin/openzeppelin-contracts/pull/3305)) ##### Upgradeability notice - `TimelockController`: **(Action needed)** The upgrade from <4.6 to >=4.6 introduces a new `CANCELLER_ROLE` that requires set up to be assignable. After the upgrade, only addresses with this role will have the ability to cancel. Proposers will no longer be able to cancel. Assigning cancellers can be done by an admin (including the timelock itself) once the role admin is set up. To do this, we recommend upgrading to the `TimelockControllerWith46MigrationUpgradeable` contract and then calling the `migrateTo46` function. ##### Breaking changes - `Governor`: Adds internal virtual `_getVotes` method that must be implemented; this is a breaking change for existing concrete extensions to `Governor`. To fix this on an existing voting module extension, rename `getVotes` to `_getVotes` and add a `bytes memory` argument. ([#​3043](https://togithub.com/OpenZeppelin/openzeppelin-contracts/pull/3043)) - `Governor`: Adds `params` parameter to internal virtual `_countVote` method; this is a breaking change for existing concrete extensions to `Governor`. To fix this on an existing counting module extension, add a `bytes memory` argument to `_countVote`. ([#​3043](https://togithub.com/OpenZeppelin/openzeppelin-contracts/pull/3043)) - `Governor`: Does not emit `VoteCast` event when params data is non-empty; instead emits `VoteCastWithParams` event. To fix this on an integration that consumes the `VoteCast` event, also fetch/monitor `VoteCastWithParams` events. ([#​3043](https://togithub.com/OpenZeppelin/openzeppelin-contracts/pull/3043)) - `Votes`: The internal virtual function `_getVotingUnits` was made `view` (which was accidentally missing). Any overrides should now be updated so they are `view` as well. ### [`v4.5.0`](https://togithub.com/OpenZeppelin/openzeppelin-contracts/blob/HEAD/CHANGELOG.md#450-2022-02-09) [Compare Source](https://togithub.com/OpenZeppelin/openzeppelin-contracts/compare/v4.4.2...v4.5.0) - `ERC2981`: add implementation of the royalty standard, and the respective extensions for `ERC721` and `ERC1155`. ([#​3012](https://togithub.com/OpenZeppelin/openzeppelin-contracts/pull/3012)) - `GovernorTimelockControl`: improve the `state()` function to have it reflect cases where a proposal has been canceled directly on the timelock. ([#​2977](https://togithub.com/OpenZeppelin/openzeppelin-contracts/pull/2977)) - Preset contracts are now deprecated in favor of [Contracts Wizard](https://wizard.openzeppelin.com). ([#​2986](https://togithub.com/OpenZeppelin/openzeppelin-contracts/pull/2986)) - `Governor`: add a relay function to help recover assets sent to a governor that is not its own executor (e.g. when using a timelock). ([#​2926](https://togithub.com/OpenZeppelin/openzeppelin-contracts/pull/2926)) - `GovernorPreventLateQuorum`: add new module to ensure a minimum voting duration is available after the quorum is reached. ([#​2973](https://togithub.com/OpenZeppelin/openzeppelin-contracts/pull/2973)) - `ERC721`: improved revert reason when transferring from wrong owner. ([#​2975](https://togithub.com/OpenZeppelin/openzeppelin-contracts/pull/2975)) - `Votes`: Added a base contract for vote tracking with delegation. ([#​2944](https://togithub.com/OpenZeppelin/openzeppelin-contracts/pull/2944)) - `ERC721Votes`: Added an extension of ERC721 enabled with vote tracking and delegation. ([#​2944](https://togithub.com/OpenZeppelin/openzeppelin-contracts/pull/2944)) - `ERC2771Context`: use immutable storage to store the forwarder address, no longer an issue since Solidity >=0.8.8 allows reading immutable variables in the constructor. ([#​2917](https://togithub.com/OpenZeppelin/openzeppelin-contracts/pull/2917)) - `Base64`: add a library to parse bytes into base64 strings using `encode(bytes memory)` function, and provide examples to show how to use to build URL-safe `tokenURIs`. ([#​2884](https://togithub.com/OpenZeppelin/openzeppelin-contracts/pull/2884)) - `ERC20`: reduce allowance before triggering transfer. ([#​3056](https://togithub.com/OpenZeppelin/openzeppelin-contracts/pull/3056)) - `ERC20`: do not update allowance on `transferFrom` when allowance is `type(uint256).max`. ([#​3085](https://togithub.com/OpenZeppelin/openzeppelin-contracts/pull/3085)) - `ERC20`: add a `_spendAllowance` internal function. ([#​3170](https://togithub.com/OpenZeppelin/openzeppelin-contracts/pull/3170)) - `ERC20Burnable`: do not update allowance on `burnFrom` when allowance is `type(uint256).max`. ([#​3170](https://togithub.com/OpenZeppelin/openzeppelin-contracts/pull/3170)) - `ERC777`: do not update allowance on `transferFrom` when allowance is `type(uint256).max`. ([#​3085](https://togithub.com/OpenZeppelin/openzeppelin-contracts/pull/3085)) - `ERC777`: add a `_spendAllowance` internal function. ([#​3170](https://togithub.com/OpenZeppelin/openzeppelin-contracts/pull/3170)) - `SignedMath`: a new signed version of the Math library with `max`, `min`, and `average`. ([#​2686](https://togithub.com/OpenZeppelin/openzeppelin-contracts/pull/2686)) - `SignedMath`: add an `abs(int256)` method that returns the unsigned absolute value of a signed value. ([#​2984](https://togithub.com/OpenZeppelin/openzeppelin-contracts/pull/2984)) - `ERC1967Upgrade`: Refactor the secure upgrade to use `ERC1822` instead of the previous rollback mechanism. This reduces code complexity and attack surface with similar security guarantees. ([#​3021](https://togithub.com/OpenZeppelin/openzeppelin-contracts/pull/3021)) - `UUPSUpgradeable`: Add `ERC1822` compliance to support the updated secure upgrade mechanism. ([#​3021](https://togithub.com/OpenZeppelin/openzeppelin-contracts/pull/3021)) - Some more functions have been made virtual to customize them via overrides. In many cases this will not imply that other functions in the contract will automatically adapt to the overridden definitions. People who wish to override should consult the source code to understand the impact and if they need to override any additional functions to achieve the desired behavior. ##### Breaking changes - `ERC1967Upgrade`: The function `_upgradeToAndCallSecure` was renamed to `_upgradeToAndCallUUPS`, along with the change in security mechanism described above. - `Address`: The Solidity pragma is increased from `^0.8.0` to `^0.8.1`. This is required by the `account.code.length` syntax that replaces inline assembly. This may require users to bump their compiler version from `0.8.0` to `0.8.1` or later. Note that other parts of the code already include stricter requirements. ### [`v4.4.2`](https://togithub.com/OpenZeppelin/openzeppelin-contracts/blob/HEAD/CHANGELOG.md#442-2022-01-11) [Compare Source](https://togithub.com/OpenZeppelin/openzeppelin-contracts/compare/v4.4.1...v4.4.2) ##### Bugfixes - `GovernorCompatibilityBravo`: Fix error in the encoding of calldata for proposals submitted through the compatibility interface with explicit signatures. ([#​3100](https://togithub.com/OpenZeppelin/openzeppelin-contracts/pull/3100)) ### [`v4.4.1`](https://togithub.com/OpenZeppelin/openzeppelin-contracts/blob/HEAD/CHANGELOG.md#441-2021-12-14) [Compare Source](https://togithub.com/OpenZeppelin/openzeppelin-contracts/compare/v4.4.0...v4.4.1) - `Initializable`: change the existing `initializer` modifier and add a new `onlyInitializing` modifier to prevent reentrancy risk. ([#​3006](https://togithub.com/OpenZeppelin/openzeppelin-contracts/pull/3006)) ##### Breaking change It is no longer possible to call an `initializer`-protected function from within another `initializer` function outside the context of a constructor. Projects using OpenZeppelin upgradeable proxies should continue to work as is, since in the common case the initializer is invoked in the constructor directly. If this is not the case for you, the suggested change is to use the new `onlyInitializing` modifier in the following way: ```diff contract A { - function initialize() public initializer { ... } + function initialize() internal onlyInitializing { ... } } contract B is A { function initialize() public initializer { A.initialize(); } } ``` ### [`v4.4.0`](https://togithub.com/OpenZeppelin/openzeppelin-contracts/blob/HEAD/CHANGELOG.md#440-2021-11-25) [Compare Source](https://togithub.com/OpenZeppelin/openzeppelin-contracts/compare/v4.3.3...v4.4.0) - `Ownable`: add an internal `_transferOwnership(address)`. ([#​2568](https://togithub.com/OpenZeppelin/openzeppelin-contracts/pull/2568)) - `AccessControl`: add internal `_grantRole(bytes32,address)` and `_revokeRole(bytes32,address)`. ([#​2568](https://togithub.com/OpenZeppelin/openzeppelin-contracts/pull/2568)) - `AccessControl`: mark `_setupRole(bytes32,address)` as deprecated in favor of `_grantRole(bytes32,address)`. ([#​2568](https://togithub.com/OpenZeppelin/openzeppelin-contracts/pull/2568)) - `AccessControlEnumerable`: hook into `_grantRole(bytes32,address)` and `_revokeRole(bytes32,address)`. ([#​2946](https://togithub.com/OpenZeppelin/openzeppelin-contracts/pull/2946)) - `EIP712`: cache `address(this)` to immutable storage to avoid potential issues if a vanilla contract is used in a delegatecall context. ([#​2852](https://togithub.com/OpenZeppelin/openzeppelin-contracts/pull/2852)) - Add internal `_setApprovalForAll` to `ERC721` and `ERC1155`. ([#​2834](https://togithub.com/OpenZeppelin/openzeppelin-contracts/pull/2834)) - `Governor`: shift vote start and end by one block to better match Compound's GovernorBravo and prevent voting at the Governor level if the voting snapshot is not ready. ([#​2892](https://togithub.com/OpenZeppelin/openzeppelin-contracts/pull/2892)) - `GovernorCompatibilityBravo`: consider quorum an inclusive rather than exclusive minimum to match Compound's GovernorBravo. ([#​2974](https://togithub.com/OpenZeppelin/openzeppelin-contracts/pull/2974)) - `GovernorSettings`: a new governor module that manages voting settings updatable through governance actions. ([#​2904](https://togithub.com/OpenZeppelin/openzeppelin-contracts/pull/2904)) - `PaymentSplitter`: now supports ERC20 assets in addition to Ether. ([#​2858](https://togithub.com/OpenZeppelin/openzeppelin-contracts/pull/2858)) - `ECDSA`: add a variant of `toEthSignedMessageHash` for arbitrary length message hashing. ([#​2865](https://togithub.com/OpenZeppelin/openzeppelin-contracts/pull/2865)) - `MerkleProof`: add a `processProof` function that returns the rebuilt root hash given a leaf and a proof. ([#​2841](https://togithub.com/OpenZeppelin/openzeppelin-contracts/pull/2841)) - `VestingWallet`: new contract that handles the vesting of Ether and ERC20 tokens following a customizable vesting schedule. ([#​2748](https://togithub.com/OpenZeppelin/openzeppelin-contracts/pull/2748)) - `Governor`: enable receiving Ether when a Timelock contract is not used. ([#​2849](https://togithub.com/OpenZeppelin/openzeppelin-contracts/pull/2849)) - `GovernorTimelockCompound`: fix ability to use Ether stored in the Timelock contract. ([#​2849](https://togithub.com/OpenZeppelin/openzeppelin-contracts/pull/2849)) ### [`v4.3.3`](https://togithub.com/OpenZeppelin/openzeppelin-contracts/blob/HEAD/CHANGELOG.md#433-2021-11-08) [Compare Source](https://togithub.com/OpenZeppelin/openzeppelin-contracts/compare/v4.3.2...v4.3.3) - `ERC1155Supply`: Handle `totalSupply` changes by hooking into `_beforeTokenTransfer` to ensure consistency of balances and supply during `IERC1155Receiver.onERC1155Received` calls. ### [`v4.3.2`](https://togithub.com/OpenZeppelin/openzeppelin-contracts/blob/HEAD/CHANGELOG.md#432-2021-09-14) [Compare Source](https://togithub.com/OpenZeppelin/openzeppelin-contracts/compare/v4.3.1...v4.3.2) - `UUPSUpgradeable`: Add modifiers to prevent `upgradeTo` and `upgradeToAndCall` being executed on any contract that is not the active ERC1967 proxy. This prevents these functions being called on implementation contracts or minimal ERC1167 clones, in particular. ### [`v4.3.1`](https://togithub.com/OpenZeppelin/openzeppelin-contracts/blob/HEAD/CHANGELOG.md#431-2021-08-26) [Compare Source](https://togithub.com/OpenZeppelin/openzeppelin-contracts/compare/v4.3.0...v4.3.1) - `TimelockController`: Add additional isOperationReady check. ### [`v4.3.0`](https://togithub.com/OpenZeppelin/openzeppelin-contracts/blob/HEAD/CHANGELOG.md#430-2021-08-17) [Compare Source](https://togithub.com/OpenZeppelin/openzeppelin-contracts/compare/v4.2.0...v4.3.0) - `ERC2771Context`: use private variable from storage to store the forwarder address. Fixes issues where `_msgSender()` was not callable from constructors. ([#​2754](https://togithub.com/OpenZeppelin/openzeppelin-contracts/pull/2754)) - `EnumerableSet`: add `values()` functions that returns an array containing all values in a single call. ([#​2768](https://togithub.com/OpenZeppelin/openzeppelin-contracts/pull/2768)) - `Governor`: added a modular system of `Governor` contracts based on `GovernorAlpha` and `GovernorBravo`. ([#​2672](https://togithub.com/OpenZeppelin/openzeppelin-contracts/pull/2672)) - Add an `interfaces` folder containing solidity interfaces to final ERCs. ([#​2517](https://togithub.com/OpenZeppelin/openzeppelin-contracts/pull/2517)) - `ECDSA`: add `tryRecover` functions that will not throw if the signature is invalid, and will return an error flag instead. ([#​2661](https://togithub.com/OpenZeppelin/openzeppelin-contracts/pull/2661)) - `SignatureChecker`: Reduce gas usage of the `isValidSignatureNow` function for the "signature by EOA" case. ([#​2661](https://togithub.com/OpenZeppelin/openzeppelin-contracts/pull/2661)) ### [`v4.2.0`](https://togithub.com/OpenZeppelin/openzeppelin-contracts/blob/HEAD/CHANGELOG.md#420-2021-06-30) [Compare Source](https://togithub.com/OpenZeppelin/openzeppelin-contracts/compare/v4.1.0...v4.2.0) - `ERC20Votes`: add a new extension of the `ERC20` token with support for voting snapshots and delegation. ([#​2632](https://togithub.com/OpenZeppelin/openzeppelin-contracts/pull/2632)) - `ERC20VotesComp`: Variant of `ERC20Votes` that is compatible with Compound's `Comp` token interface but restricts supply to `uint96`. ([#​2706](https://togithub.com/OpenZeppelin/openzeppelin-contracts/pull/2706)) - `ERC20Wrapper`: add a new extension of the `ERC20` token which wraps an underlying token. Deposit and withdraw guarantee that the total supply is backed by a corresponding amount of underlying token. ([#​2633](https://togithub.com/OpenZeppelin/openzeppelin-contracts/pull/2633)) - Enumerables: Improve gas cost of removal in `EnumerableSet` and `EnumerableMap`. - Enumerables: Improve gas cost of lookup in `EnumerableSet` and `EnumerableMap`. - `Counter`: add a reset method. ([#​2678](https://togithub.com/OpenZeppelin/openzeppelin-contracts/pull/2678)) - Tokens: Wrap definitely safe subtractions in `unchecked` blocks. - `Math`: Add a `ceilDiv` method for performing ceiling division. - `ERC1155Supply`: add a new `ERC1155` extension that keeps track of the totalSupply of each tokenId. ([#​2593](https://togithub.com/OpenZeppelin/openzeppelin-contracts/pull/2593)) - `BitMaps`: add a new `BitMaps` library that provides a storage efficient datastructure for `uint256` to `bool` mapping with contiguous keys. ([#​2710](https://togithub.com/OpenZeppelin/openzeppelin-contracts/pull/2710)) ##### Breaking Changes - `ERC20FlashMint` is no longer a Draft ERC. ([#​2673](https://togithub.com/OpenZeppelin/openzeppelin-contracts/pull/2673))) **How to update:** Change your import paths by removing the `draft-` prefix from `@openzeppelin/contracts/token/ERC20/extensions/draft-ERC20FlashMint.sol`. > See [Releases and Stability: Drafts](https://docs.openzeppelin.com/contracts/4.x/releases-stability#drafts). ### [`v4.1.0`](https://togithub.com/OpenZeppelin/openzeppelin-contracts/blob/HEAD/CHANGELOG.md#410-2021-04-29) [Compare Source](https://togithub.com/OpenZeppelin/openzeppelin-contracts/compare/v4.0.0...v4.1.0) - `IERC20Metadata`: add a new extended interface that includes the optional `name()`, `symbol()` and `decimals()` functions. ([#​2561](https://togithub.com/OpenZeppelin/openzeppelin-contracts/pull/2561)) - `ERC777`: make reception acquirement optional in `_mint`. ([#​2552](https://togithub.com/OpenZeppelin/openzeppelin-contracts/pull/2552)) - `ERC20Permit`: add a `_useNonce` to enable further usage of ERC712 signatures. ([#​2565](https://togithub.com/OpenZeppelin/openzeppelin-contracts/pull/2565)) - `ERC20FlashMint`: add an implementation of the ERC3156 extension for flash-minting ERC20 tokens. ([#​2543](https://togithub.com/OpenZeppelin/openzeppelin-contracts/pull/2543)) - `SignatureChecker`: add a signature verification library that supports both EOA and ERC1271 compliant contracts as signers. ([#​2532](https://togithub.com/OpenZeppelin/openzeppelin-contracts/pull/2532)) - `Multicall`: add abstract contract with `multicall(bytes[] calldata data)` function to bundle multiple calls together ([#​2608](https://togithub.com/OpenZeppelin/openzeppelin-contracts/pull/2608)) - `ECDSA`: add support for ERC2098 short-signatures. ([#​2582](https://togithub.com/OpenZeppelin/openzeppelin-contracts/pull/2582)) - `AccessControl`: add an `onlyRole` modifier to restrict specific function to callers bearing a specific role. ([#​2609](https://togithub.com/OpenZeppelin/openzeppelin-contracts/pull/2609)) - `StorageSlot`: add a library for reading and writing primitive types to specific storage slots. ([#​2542](https://togithub.com/OpenZeppelin/openzeppelin-contracts/pull/2542)) - UUPS Proxies: add `UUPSUpgradeable` to implement the UUPS proxy pattern together with `EIP1967Proxy`. ([#​2542](https://togithub.com/OpenZeppelin/openzeppelin-contracts/pull/2542)) ##### Breaking changes This release includes two small breaking changes in `TimelockController`. 1. The `onlyRole` modifier in this contract was designed to let anyone through if the role was granted to `address(0)`, allowing the possibility to to make a role "open", which can be used for `EXECUTOR_ROLE`. This modifier is now replaced by `AccessControl.onlyRole`, which does not have this ability. The previous behavior was moved to the modifier `TimelockController.onlyRoleOrOpenRole`. 2. It was possible to make `PROPOSER_ROLE` an open role (as described in the previous item) if it was granted to `address(0)`. This would affect the `schedule`, `scheduleBatch`, and `cancel` operations in `TimelockController`. This ability was removed as it does not make sense to open up the `PROPOSER_ROLE` in the same way that it does for `EXECUTOR_ROLE`. ### [`v4.0.0`](https://togithub.com/OpenZeppelin/openzeppelin-contracts/blob/HEAD/CHANGELOG.md#400-2021-03-23) [Compare Source](https://togithub.com/OpenZeppelin/openzeppelin-contracts/compare/v3.4.2...v4.0.0) - Now targeting the 0.8.x line of Solidity compilers. For 0.6.x (resp 0.7.x) support, use version 3.4.0 (resp 3.4.0-solc-0.7) of OpenZeppelin. - `Context`: making `_msgData` return `bytes calldata` instead of `bytes memory` ([#​2492](https://togithub.com/OpenZeppelin/openzeppelin-contracts/pull/2492)) - `ERC20`: removed the `_setDecimals` function and the storage slot associated to decimals. ([#​2502](https://togithub.com/OpenZeppelin/openzeppelin-contracts/pull/2502)) - `Strings`: addition of a `toHexString` function. ([#​2504](https://togithub.com/OpenZeppelin/openzeppelin-contracts/pull/2504)) - `EnumerableMap`: change implementation to optimize for `key → value` lookups instead of enumeration. ([#​2518](https://togithub.com/OpenZeppelin/openzeppelin-contracts/pull/2518)) - `GSN`: deprecate GSNv1 support in favor of upcoming support for GSNv2. ([#​2521](https://togithub.com/OpenZeppelin/openzeppelin-contracts/pull/2521)) - `ERC165`: remove uses of storage in the base ERC165 implementation. ERC165 based contracts now use storage-less virtual functions. Old behavior remains available in the `ERC165Storage` extension. ([#​2505](https://togithub.com/OpenZeppelin/openzeppelin-contracts/pull/2505)) - `Initializable`: make initializer check stricter during construction. ([#​2531](https://togithub.com/OpenZeppelin/openzeppelin-contracts/pull/2531)) - `ERC721`: remove enumerability of tokens from the base implementation. This feature is now provided separately through the `ERC721Enumerable` extension. ([#​2511](https://togithub.com/OpenZeppelin/openzeppelin-contracts/pull/2511)) - `AccessControl`: removed enumerability by default for a more lightweight contract. It is now opt-in through `AccessControlEnumerable`. ([#​2512](https://togithub.com/OpenZeppelin/openzeppelin-contracts/pull/2512)) - Meta Transactions: add `ERC2771Context` and a `MinimalForwarder` for meta-transactions. ([#​2508](https://togithub.com/OpenZeppelin/openzeppelin-contracts/pull/2508)) - Overall reorganization of the contract folder to improve clarity and discoverability. ([#​2503](https://togithub.com/OpenZeppelin/openzeppelin-contracts/pull/2503)) - `ERC20Capped`: optimize gas usage by enforcing the check directly in `_mint`. ([#​2524](https://togithub.com/OpenZeppelin/openzeppelin-contracts/pull/2524)) - Rename `UpgradeableProxy` to `ERC1967Proxy`. ([#​2547](https://togithub.com/OpenZeppelin/openzeppelin-contracts/pull/2547)) - `ERC777`: optimize the gas costs of the constructor. ([#​2551](https://togithub.com/OpenZeppelin/openzeppelin-contracts/pull/2551)) - `ERC721URIStorage`: add a new extension that implements the `_setTokenURI` behavior as it was available in 3.4.0. ([#​2555](https://togithub.com/OpenZeppelin/openzeppelin-contracts/pull/2555)) - `AccessControl`: added ERC165 interface detection. ([#​2562](https://togithub.com/OpenZeppelin/openzeppelin-contracts/pull/2562)) - `ERC1155`: make `uri` public so overloading function can call it using super. ([#​2576](https://togithub.com/OpenZeppelin/openzeppelin-contracts/pull/2576)) ##### Bug fixes for beta releases - `AccessControlEnumerable`: Fixed `renounceRole` not updating enumerable set of addresses for a role. ([#​2572](https://togithub.com/OpenZeppelin/openzeppelin-contracts/pull/2572)) ##### How to upgrade from 3.x Since this version has moved a few contracts to different directories, users upgrading from a previous version will need to adjust their import statements. To make this easier, the package includes a script that will migrate import statements automatically. After upgrading to the latest version of the package, run: npx openzeppelin-contracts-migrate-imports Make sure you're using git or another version control system to be able to recover from any potential error in our script. ##### How to upgrade from 4.0-beta.x Some further changes have been done between the different beta iterations. Transitions made during this period are configured in the `migrate-imports` script. Consequently, you can upgrade from any previous 4.0-beta.x version using the same script as described in the *How to upgrade from 3.x* section.

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Package New capabilities Transitives Size Publisher
npm/@openzeppelin/contracts@4.8.3 None 0 1.89 MB frangio
npm/@openzeppelin/contracts@4.9.6 None 0 2.02 MB frangio

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