In affected releases of gRPC-Go, it is possible for an attacker to send HTTP/2 requests, cancel them, and send subsequent requests, which is valid by the HTTP/2 protocol, but would cause the gRPC-Go server to launch more concurrent method handlers than the configured maximum stream limit.
Patches
This vulnerability was addressed by #6703 and has been included in patch releases: 1.56.3, 1.57.1, 1.58.3. It is also included in the latest release, 1.59.0.
Along with applying the patch, users should also ensure they are using the grpc.MaxConcurrentStreams server option to apply a limit to the server's resources used for any single connection.
swift-nio-http2 is vulnerable to a denial-of-service vulnerability in which a malicious client can create and then reset a large number of HTTP/2 streams in a short period of time. This causes swift-nio-http2 to commit to a large amount of expensive work which it then throws away, including creating entirely new Channels to serve the traffic. This can easily overwhelm an EventLoop and prevent it from making forward progress.
swift-nio-http2 1.28 contains a remediation for this issue that applies reset counter using a sliding window. This constrains the number of stream resets that may occur in a given window of time. Clients violating this limit will have their connections torn down. This allows clients to continue to cancel streams for legitimate reasons, while constraining malicious actors.
Release Notes
grpc/grpc-go (google.golang.org/grpc)
### [`v1.56.3`](https://togithub.com/grpc/grpc-go/releases/tag/v1.56.3): Release 1.56.3
[Compare Source](https://togithub.com/grpc/grpc-go/compare/v1.56.2...v1.56.3)
### Security
- server: prohibit more than MaxConcurrentStreams handlers from running at once (CVE-2023-44487)
In addition to this change, applications should ensure they do not leave running tasks behind related to the RPC before returning from method handlers, or should enforce appropriate limits on any such work.
### [`v1.56.2`](https://togithub.com/grpc/grpc-go/releases/tag/v1.56.2): Release 1.56.2
[Compare Source](https://togithub.com/grpc/grpc-go/compare/v1.56.1...v1.56.2)
- status: To fix a panic, `status.FromError` now returns an error with `codes.Unknown` when the error implements the `GRPCStatus()` method, and calling `GRPCStatus()` returns `nil`. ([#6374](https://togithub.com/grpc/grpc-go/issues/6374))
### [`v1.56.1`](https://togithub.com/grpc/grpc-go/releases/tag/v1.56.1): Release 1.56.1
[Compare Source](https://togithub.com/grpc/grpc-go/compare/v1.56.0...v1.56.1)
- client: handle empty address lists correctly in addrConn.updateAddrs
### [`v1.56.0`](https://togithub.com/grpc/grpc-go/releases/tag/v1.56.0): Release 1.56.0
[Compare Source](https://togithub.com/grpc/grpc-go/compare/v1.55.1...v1.56.0)
### New Features
- client: support channel idleness using `WithIdleTimeout` dial option ([#6263](https://togithub.com/grpc/grpc-go/issues/6263))
- This feature is currently disabled by default, but will be enabled with a 30 minute default in the future.
- client: when using pickfirst, keep channel state in TRANSIENT_FAILURE until it becomes READY ([gRFC A62](https://togithub.com/grpc/proposal/blob/master/A62-pick-first.md)) ([#6306](https://togithub.com/grpc/grpc-go/issues/6306))
- xds: Add support for Custom LB Policies ([gRFC A52](https://togithub.com/grpc/proposal/blob/master/A52-xds-custom-lb-policies.md)) ([#6224](https://togithub.com/grpc/grpc-go/issues/6224))
- xds: support pick_first Custom LB policy ([gRFC A62](https://togithub.com/grpc/proposal/blob/master/A62-pick-first.md)) ([#6314](https://togithub.com/grpc/grpc-go/issues/6314)) ([#6317](https://togithub.com/grpc/grpc-go/issues/6317))
- client: add support for pickfirst address shuffling ([gRFC A62](https://togithub.com/grpc/proposal/blob/master/A62-pick-first.md)) ([#6311](https://togithub.com/grpc/grpc-go/issues/6311))
- xds: Add support for String Matcher Header Matcher in RDS ([#6313](https://togithub.com/grpc/grpc-go/issues/6313))
- xds/outlierdetection: Add Channelz Logger to Outlier Detection LB ([#6145](https://togithub.com/grpc/grpc-go/issues/6145))
- Special Thanks: [@s-matyukevich](https://togithub.com/s-matyukevich)
- xds: enable RLS in xDS by default ([#6343](https://togithub.com/grpc/grpc-go/issues/6343))
- orca: add support for application_utilization field and missing range checks on several metrics setters
- balancer/weightedroundrobin: add new LB policy for balancing between backends based on their load reports ([gRFC A58](https://togithub.com/grpc/proposal/blob/master/A58-client-side-weighted-round-robin-lb-policy.md)) ([#6241](https://togithub.com/grpc/grpc-go/issues/6241))
- authz: add conversion of json to RBAC Audit Logging config ([#6192](https://togithub.com/grpc/grpc-go/issues/6192))
- authz: add support for stdout logger ([#6230](https://togithub.com/grpc/grpc-go/issues/6230) and [#6298](https://togithub.com/grpc/grpc-go/issues/6298))
- authz: support customizable audit functionality for authorization policy ([#6192](https://togithub.com/grpc/grpc-go/issues/6192) [#6230](https://togithub.com/grpc/grpc-go/issues/6230)Â [#6298](https://togithub.com/grpc/grpc-go/issues/6298) [#6158](https://togithub.com/grpc/grpc-go/issues/6158) [#6304](https://togithub.com/grpc/grpc-go/issues/6304) and [#6225](https://togithub.com/grpc/grpc-go/issues/6225))
### Bug Fixes
- orca: fix a race at startup of out-of-band metric subscriptions that would cause the report interval to request 0 ([#6245](https://togithub.com/grpc/grpc-go/issues/6245))
- xds/xdsresource: Fix Outlier Detection Config Handling and correctly set xDS Defaults ([#6361](https://togithub.com/grpc/grpc-go/issues/6361))
- xds/outlierdetection: Fix Outlier Detection Config Handling by setting defaults in ParseConfig() ([#6361](https://togithub.com/grpc/grpc-go/issues/6361))
### API Changes
- orca: allow a ServerMetricsProvider to be passed to the ORCA service and ServerOption ([#6223](https://togithub.com/grpc/grpc-go/issues/6223))
### [`v1.55.1`](https://togithub.com/grpc/grpc-go/releases/tag/v1.55.1): Release 1.55.1
[Compare Source](https://togithub.com/grpc/grpc-go/compare/v1.55.0...v1.55.1)
- status: To fix a panic, `status.FromError` now returns an error with `codes.Unknown` when the error implements the `GRPCStatus()` method, and calling `GRPCStatus()` returns `nil`. ([#6374](https://togithub.com/grpc/grpc-go/issues/6374))
### [`v1.55.0`](https://togithub.com/grpc/grpc-go/releases/tag/v1.55.0): Release 1.55.0
[Compare Source](https://togithub.com/grpc/grpc-go/compare/v1.54.1...v1.55.0)
### Behavior Changes
- xds: enable federation support by default ([#6151](https://togithub.com/grpc/grpc-go/issues/6151))
- status: `status.Code` and `status.FromError` handle wrapped errors ([#6031](https://togithub.com/grpc/grpc-go/issues/6031) and [#6150](https://togithub.com/grpc/grpc-go/issues/6150))
- Special Thanks: [@psyhatter](https://togithub.com/psyhatter)
### New Features
- xds/xdsclient: support `ignore_resource_deletion` server feature as per gRFC [A53](https://togithub.com/grpc/proposal/blob/master/A53-xds-ignore-resource-deletion.md) ([#6035](https://togithub.com/grpc/grpc-go/issues/6035))
- security/advancedtls: add min/max TLS version selection options ([#6007](https://togithub.com/grpc/grpc-go/issues/6007))
- Special Thanks: [@joeljeske](https://togithub.com/joeljeske)
### Bug Fixes
- xds: stop routing RPCs to deleted clusters ([#6125](https://togithub.com/grpc/grpc-go/issues/6125))
- client: fix race between stream creation and GOAWAY receipt, which could lead to spurious UNAVAILABLE stream errors ([#6142](https://togithub.com/grpc/grpc-go/issues/6142))
### Performance Improvements
- server: improve stream handler goroutine worker allocation when [`NumStreamWorkers`](https://pkg.go.dev/google.golang.org/grpc#NumStreamWorkers) is used ([#6004](https://togithub.com/grpc/grpc-go/issues/6004))
- Special Thanks: [@SaveTheRbtz](https://togithub.com/SaveTheRbtz)
### [`v1.54.1`](https://togithub.com/grpc/grpc-go/releases/tag/v1.54.1): Release 1.54.1
[Compare Source](https://togithub.com/grpc/grpc-go/compare/v1.54.0...v1.54.1)
### Bug Fixes
- credentials/alts: revert a change that causes a crash in the handshaker
### [`v1.54.0`](https://togithub.com/grpc/grpc-go/releases/tag/v1.54.0): Release 1.54.0
[Compare Source](https://togithub.com/grpc/grpc-go/compare/v1.53.0...v1.54.0)
### Behavior Changes
- xds: remove support for xDS v2 transport API ([#6013](https://togithub.com/grpc/grpc-go/issues/6013))
### New Features
- server: expose `SetSendCompressor` API to set send compressor name ([#5744](https://togithub.com/grpc/grpc-go/issues/5744))
- Special Thanks: [@jronak](https://togithub.com/jronak)
- xdsclient: include `Node` proto only in the first discovery request message, to improve performance ([#6078](https://togithub.com/grpc/grpc-go/issues/6078))
### Bug Fixes
- metadata: fix validation logic and properly validate metadata appended via `AppendToOutgoingContext` ([#6001](https://togithub.com/grpc/grpc-go/issues/6001))
- Special Thanks: [@ktalg](https://togithub.com/ktalg)
- transport: do not close connections when we encounter I/O errors until after all data is consumed ([#6110](https://togithub.com/grpc/grpc-go/issues/6110))
- ringhash: ensure addresses are consistently hashed across updates ([#6066](https://togithub.com/grpc/grpc-go/issues/6066))
- xds/clusterimpl: fix a bug causing unnecessary closing and re-opening of LRS streams ([#6112](https://togithub.com/grpc/grpc-go/issues/6112))
- xds: NACK route configuration if sum of weights of weighted clusters exceeds uint32\_max ([#6085](https://togithub.com/grpc/grpc-go/issues/6085))
### Documentation
- resolver: update `Resolver.Scheme()` docstring to mention requirement of lowercase scheme names ([#6014](https://togithub.com/grpc/grpc-go/issues/6014))
- resolver: document expected error handling of `UpdateState` errors ([#6002](https://togithub.com/grpc/grpc-go/issues/6002))
- Special Thanks: [@fho](https://togithub.com/fho)
- examples: add example for ORCA load reporting ([#6114](https://togithub.com/grpc/grpc-go/issues/6114))
- examples: add an example to illustrate authorization (authz) support ([#5920](https://togithub.com/grpc/grpc-go/issues/5920))
- Special Thanks: [@KenxinKun](https://togithub.com/KenxinKun)
### [`v1.53.0`](https://togithub.com/grpc/grpc-go/releases/tag/v1.53.0): Release 1.53.0
[Compare Source](https://togithub.com/grpc/grpc-go/compare/v1.52.3...v1.53.0)
### API Changes
- balancer: support injection of per-call metadata from LB policies ([#5853](https://togithub.com/grpc/grpc-go/issues/5853))
- resolver: remove deprecated field `resolver.Target.Endpoint` and replace with `resolver.Target.Endpoint()` ([#5852](https://togithub.com/grpc/grpc-go/issues/5852))
- Special Thanks: [@kylejb](https://togithub.com/kylejb)
### New Features
- xds/ringhash: introduce `GRPC_RING_HASH_CAP` environment variable to override the maximum ring size. ([#5884](https://togithub.com/grpc/grpc-go/issues/5884))
- rls: propagate headers received in RLS response to backends ([#5883](https://togithub.com/grpc/grpc-go/issues/5883))
### Bug Fixes
- transport: drain client transport when streamID approaches MaxStreamID ([#5889](https://togithub.com/grpc/grpc-go/issues/5889))
- server: after GracefulStop, ensure connections are closed when final RPC completes ([#5968](https://togithub.com/grpc/grpc-go/issues/5968))
- server: fix a few issues where grpc server uses RST_STREAM for non-HTTP/2 errors ([#5893](https://togithub.com/grpc/grpc-go/issues/5893))
- xdsclient: fix race which can happen when multiple load reporting calls are made at the same time. ([#5927](https://togithub.com/grpc/grpc-go/issues/5927))
- rls: fix a data race involving the LRU cache ([#5925](https://togithub.com/grpc/grpc-go/issues/5925))
- xds: fix panic involving double close of channel in xDS transport ([#5959](https://togithub.com/grpc/grpc-go/issues/5959))
- gcp/observability: update method name validation ([#5951](https://togithub.com/grpc/grpc-go/issues/5951))
### Documentation
- credentials/oauth: mark `NewOauthAccess` as deprecated ([#5882](https://togithub.com/grpc/grpc-go/issues/5882))
- Special Thanks: [@buzzsurfr](https://togithub.com/buzzsurfr)
### [`v1.52.3`](https://togithub.com/grpc/grpc-go/releases/tag/v1.52.3): Release 1.52.3
[Compare Source](https://togithub.com/grpc/grpc-go/compare/v1.52.1...v1.52.3)
### Bug Fixes
- Fix user-agent version
### [`v1.52.1`](https://togithub.com/grpc/grpc-go/releases/tag/v1.52.1): Release 1.52.1
[Compare Source](https://togithub.com/grpc/grpc-go/compare/v1.52.0...v1.52.1)
### Bug Fixes
- grpclb: rename grpclbstate package back to state ([#5963](https://togithub.com/grpc/grpc-go/issues/5963))
### [`v1.52.0`](https://togithub.com/grpc/grpc-go/releases/tag/v1.52.0): Release 1.52.0
[Compare Source](https://togithub.com/grpc/grpc-go/compare/v1.51.0...v1.52.0)
### New Features
- xdsclient: log node ID with verbosity INFO ([#5860](https://togithub.com/grpc/grpc-go/issues/5860))
- ringhash: impose cap on `max_ring_size` to reduce possibility of OOMs ([#5801](https://togithub.com/grpc/grpc-go/issues/5801))
### Behavior Changes
- client: return an error from `Dial` if an empty target is passed and no custom dialer is present; the ClientConn would otherwise be unable to connect and perform RPCs ([#5732](https://togithub.com/grpc/grpc-go/issues/5732))
- Special Thanks: [@huangchong94](https://togithub.com/huangchong94)
### Bug Fixes
- transport (net/http server handler): respond to bad HTTP requests with status 400 (Bad Request) instead of 500 (Internal Server Error). ([#5804](https://togithub.com/grpc/grpc-go/issues/5804))
- Special Thanks: [@sjbarag](https://togithub.com/sjbarag)
- transport: Fixed closing a closed channel panic in handlePing ([#5854](https://togithub.com/grpc/grpc-go/issues/5854))
- server: fix ChainUnaryInterceptor and ChainStreamInterceptor to allow retrying handlers ([#5666](https://togithub.com/grpc/grpc-go/issues/5666))
- Special Thanks: [@yiminc](https://togithub.com/yiminc)
- transport: ensure value of `:authority` header matches server name used in TLS handshake when the latter is overridden by the name resolver ([#5748](https://togithub.com/grpc/grpc-go/issues/5748))
- Special Thanks: [@holdno](https://togithub.com/holdno)
### Documentation
- examples: add an example to illustrate the usage of stats handler ([#5657](https://togithub.com/grpc/grpc-go/issues/5657))
- Special Thanks: [@Yash-Handa](https://togithub.com/Yash-Handa)
- examples: add new example to show updating metadata in interceptors ([#5788](https://togithub.com/grpc/grpc-go/issues/5788))
- Special Thanks: [@richzw](https://togithub.com/richzw)
### [`v1.51.0`](https://togithub.com/grpc/grpc-go/releases/tag/v1.51.0): Release 1.51.0
[Compare Source](https://togithub.com/grpc/grpc-go/compare/v1.50.1...v1.51.0)
##### Behavior Changes
- xds: NACK EDS resources with duplicate addresses in accordance with a recent spec change ([#5715](https://togithub.com/grpc/grpc-go/issues/5715))
- Special Thanks: [@erni27](https://togithub.com/erni27)
- grpc: restrict status codes that can be generated by the control plane (gRFC A54) ([#5653](https://togithub.com/grpc/grpc-go/issues/5653))
##### New Features
- client: set grpc-accept-encoding header with all registered compressors ([#5541](https://togithub.com/grpc/grpc-go/issues/5541))
- Special Thanks: [@jronak](https://togithub.com/jronak)
- xds/weightedtarget: return a more meaningful error when all child policies are in `TRANSIENT_FAILURE` ([#5711](https://togithub.com/grpc/grpc-go/issues/5711))
- gcp/observability: add "started rpcs" metric ([#5768](https://togithub.com/grpc/grpc-go/issues/5768))
- xds: de-experimentalize the google-c2p-resolver ([#5707](https://togithub.com/grpc/grpc-go/issues/5707))
- balancer: add experimental Producer types and methods ([#5669](https://togithub.com/grpc/grpc-go/issues/5669))
- orca: provide a way for LB policies to receive OOB load reports ([#5669](https://togithub.com/grpc/grpc-go/issues/5669))
##### Bug Fixes
- go.mod: upgrade x/text dependency to address [CVE 2022-32149](https://www.cve.org/CVERecord?id=CVE-2022-32149) ([#5769](https://togithub.com/grpc/grpc-go/issues/5769))
- client: fix race that could lead to an incorrect connection state if it was closed immediately after the server's HTTP/2 preface was received ([#5714](https://togithub.com/grpc/grpc-go/issues/5714))
- Special Thanks: [@fuweid](https://togithub.com/fuweid)
- xds: ensure sum of the weights of all EDS localities at the same priority level does not exceed uint32 max ([#5703](https://togithub.com/grpc/grpc-go/issues/5703))
- Special Thanks: [@erni27](https://togithub.com/erni27)
- client: fix binary logging bug which logs a server header on a trailers-only response ([#5763](https://togithub.com/grpc/grpc-go/issues/5763))
- balancer/priority: fix a bug where unreleased references to removed child policies (and associated state) was causing a memory leak ([#5682](https://togithub.com/grpc/grpc-go/issues/5682))
- xds/google-c2p: validate URI schema for no authorities ([#5756](https://togithub.com/grpc/grpc-go/issues/5756))
### [`v1.50.1`](https://togithub.com/grpc/grpc-go/releases/tag/v1.50.1): Release 1.50.1
[Compare Source](https://togithub.com/grpc/grpc-go/compare/v1.50.0...v1.50.1)
New Features
- gcp/observability: support new configuration defined in public preview user guide
### [`v1.50.0`](https://togithub.com/grpc/grpc-go/releases/tag/v1.50.0): Release 1.50.0
[Compare Source](https://togithub.com/grpc/grpc-go/compare/v1.49.0...v1.50.0)
### Behavior Changes
- client: use proper "@" semantics for connecting to abstract unix sockets. ([#5678](https://togithub.com/grpc/grpc-go/issues/5678))
- This is technically a bug fix; the result is that the address was including a trailing NULL byte, which it should not have. This may break users creating the socket in Go by prefixing a NULL instead of an "@", though, so calling it out as a behavior change.
- Special Thanks: [@jachor](https://togithub.com/jachor)
### New Features
- metadata: add experimental `ValueFromIncomingContext` to more efficiently retrieve a single value ([#5596](https://togithub.com/grpc/grpc-go/issues/5596))
- Special Thanks: [@horpto](https://togithub.com/horpto)
- stats: provide peer information in `HandleConn` context ([#5589](https://togithub.com/grpc/grpc-go/issues/5589))
- Special Thanks: [@feihu-stripe](https://togithub.com/feihu-stripe)
- xds: add support for Outlier Detection, enabled by default ([#5435](https://togithub.com/grpc/grpc-go/issues/5435), [#5673](https://togithub.com/grpc/grpc-go/issues/5673))
### Bug Fixes
- client: fix deadlock in transport caused by GOAWAY racing with stream creation ([#5652](https://togithub.com/grpc/grpc-go/issues/5652))
- This should only occur with an HTTP/2 server that does not follow best practices of an advisory GOAWAY (not a grpc-go server).
- xds/xdsclient: fix a bug which was causing routes with `cluster_specifier_plugin` set to be NACKed when GRPC_EXPERIMENTAL_XDS_RLS_LB was off ([#5670](https://togithub.com/grpc/grpc-go/issues/5670))
- xds/xdsclient: NACK cluster resource if `config_source_specifier` in `lrs_server` is not `self` ([#5613](https://togithub.com/grpc/grpc-go/issues/5613))
- xds/ringhash: fix a bug which sometimes prevents the LB policy from retrying connection attempts ([#5601](https://togithub.com/grpc/grpc-go/issues/5601))
- xds/ringhash: do nothing when asked to exit `IDLE` instead of falling back on the default channel behavior of connecting to all addresses ([#5614](https://togithub.com/grpc/grpc-go/issues/5614))
- xds/rls: fix a bug which was causing the channel to be stuck in `IDLE` ([#5656](https://togithub.com/grpc/grpc-go/issues/5656))
- alts: fix a bug which was setting `WaitForReady` on handshaker service RPCs, thereby delaying fallback when required ([#5620](https://togithub.com/grpc/grpc-go/issues/5620))
- gcp/observability: fix End() to cleanup global state correctly ([#5623](https://togithub.com/grpc/grpc-go/issues/5623))
### [`v1.49.0`](https://togithub.com/grpc/grpc-go/releases/tag/v1.49.0): Release 1.49.0
[Compare Source](https://togithub.com/grpc/grpc-go/compare/v1.48.0...v1.49.0)
### New Features
- gcp/observability: add support for Environment Variable `GRPC_CONFIG_OBSERVABILITY_JSON` ([#5525](https://togithub.com/grpc/grpc-go/issues/5525))
- gcp/observability: add support for custom tags ([#5565](https://togithub.com/grpc/grpc-go/issues/5565))
### Behavior Changes
- server: reduce log level from Warning to Info for early connection establishment errors ([#5524](https://togithub.com/grpc/grpc-go/issues/5524))
- Special Thanks: [@jpkrohling](https://togithub.com/jpkrohling)
### Bug Fixes
- client: fix race in flow control that could lead to unexpected EOF errors ([#5494](https://togithub.com/grpc/grpc-go/issues/5494))
- client: fix a race that could cause RPCs to time out instead of failing more quickly with UNAVAILABLE ([#5503](https://togithub.com/grpc/grpc-go/issues/5503))
- client & server: fix a panic caused by passing a `nil` stats handler to `grpc.WithStatsHandler` or `grpc.StatsHandler` ([#5543](https://togithub.com/grpc/grpc-go/issues/5543))
- transport/server: fix a race that could cause a stray header to be sent ([#5513](https://togithub.com/grpc/grpc-go/issues/5513))
- balancer: give precedence to `IDLE` over `TRANSIENT_FAILURE` when aggregating connectivity state ([#5473](https://togithub.com/grpc/grpc-go/issues/5473))
- xds/xdsclient: request correct resource name when user specifies a new style resource name with empty authority ([#5488](https://togithub.com/grpc/grpc-go/issues/5488))
- xds/xdsclient: NACK endpoint resources with zero weight ([#5560](https://togithub.com/grpc/grpc-go/issues/5560))
- xds/xdsclient: fix bug that would reset resource version information after ADS stream restart ([#5422](https://togithub.com/grpc/grpc-go/issues/5422))
- xds/xdsclient: fix goroutine leaks when load reporting is enabled ([#5505](https://togithub.com/grpc/grpc-go/issues/5505))
- xds/ringhash: fix config update processing to recreate ring and picker when min/max ring size changes ([#5557](https://togithub.com/grpc/grpc-go/issues/5557))
- xds/ringhash: avoid recreating subChannels when update doesn't change address weight information ([#5431](https://togithub.com/grpc/grpc-go/issues/5431))
- xds/priority: fix bug which could cause priority LB to block all traffic after a config update ([#5549](https://togithub.com/grpc/grpc-go/issues/5549))
- xds: fix bug when environment variable `GRPC_EXPERIMENTAL_ENABLE_OUTLIER_DETECTION` is set to true ([#5537](https://togithub.com/grpc/grpc-go/issues/5537))
### [`v1.48.0`](https://togithub.com/grpc/grpc-go/releases/tag/v1.48.0): Release 1.48.0
[Compare Source](https://togithub.com/grpc/grpc-go/compare/v1.47.0...v1.48.0)
### Bug Fixes
- xds/priority: fix bug that could prevent higher priorities from receiving config updates ([#5417](https://togithub.com/grpc/grpc-go/issues/5417))
- RLS load balancer: don't propagate the status code returned on control plane RPCs to data plane RPCs ([#5400](https://togithub.com/grpc/grpc-go/issues/5400))
### New Features
- stats: add support for multiple stats handlers in a single client or server ([#5347](https://togithub.com/grpc/grpc-go/issues/5347))
- gcp/observability: add experimental OpenCensus tracing/metrics support ([#5372](https://togithub.com/grpc/grpc-go/issues/5372))
- xds: enable aggregate and logical DNS clusters by default ([#5380](https://togithub.com/grpc/grpc-go/issues/5380))
- credentials/google (for xds): support xdstp C2P cluster names ([#5399](https://togithub.com/grpc/grpc-go/issues/5399))
Configuration
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This PR contains the following updates:
v1.47.0->v1.56.3GitHub Vulnerability Alerts
GHSA-m425-mq94-257g
Impact
In affected releases of gRPC-Go, it is possible for an attacker to send HTTP/2 requests, cancel them, and send subsequent requests, which is valid by the HTTP/2 protocol, but would cause the gRPC-Go server to launch more concurrent method handlers than the configured maximum stream limit.
Patches
This vulnerability was addressed by #6703 and has been included in patch releases: 1.56.3, 1.57.1, 1.58.3. It is also included in the latest release, 1.59.0.
Along with applying the patch, users should also ensure they are using the
grpc.MaxConcurrentStreamsserver option to apply a limit to the server's resources used for any single connection.Workarounds
None.
References
6703
CVE-2023-44487
swift-nio-http2 is vulnerable to a denial-of-service vulnerability in which a malicious client can create and then reset a large number of HTTP/2 streams in a short period of time. This causes swift-nio-http2 to commit to a large amount of expensive work which it then throws away, including creating entirely new
Channels to serve the traffic. This can easily overwhelm anEventLoopand prevent it from making forward progress.swift-nio-http2 1.28 contains a remediation for this issue that applies reset counter using a sliding window. This constrains the number of stream resets that may occur in a given window of time. Clients violating this limit will have their connections torn down. This allows clients to continue to cancel streams for legitimate reasons, while constraining malicious actors.
Release Notes
grpc/grpc-go (google.golang.org/grpc)
### [`v1.56.3`](https://togithub.com/grpc/grpc-go/releases/tag/v1.56.3): Release 1.56.3 [Compare Source](https://togithub.com/grpc/grpc-go/compare/v1.56.2...v1.56.3) ### Security - server: prohibit more than MaxConcurrentStreams handlers from running at once (CVE-2023-44487) In addition to this change, applications should ensure they do not leave running tasks behind related to the RPC before returning from method handlers, or should enforce appropriate limits on any such work. ### [`v1.56.2`](https://togithub.com/grpc/grpc-go/releases/tag/v1.56.2): Release 1.56.2 [Compare Source](https://togithub.com/grpc/grpc-go/compare/v1.56.1...v1.56.2) - status: To fix a panic, `status.FromError` now returns an error with `codes.Unknown` when the error implements the `GRPCStatus()` method, and calling `GRPCStatus()` returns `nil`. ([#6374](https://togithub.com/grpc/grpc-go/issues/6374)) ### [`v1.56.1`](https://togithub.com/grpc/grpc-go/releases/tag/v1.56.1): Release 1.56.1 [Compare Source](https://togithub.com/grpc/grpc-go/compare/v1.56.0...v1.56.1) - client: handle empty address lists correctly in addrConn.updateAddrs ### [`v1.56.0`](https://togithub.com/grpc/grpc-go/releases/tag/v1.56.0): Release 1.56.0 [Compare Source](https://togithub.com/grpc/grpc-go/compare/v1.55.1...v1.56.0) ### New Features - client: support channel idleness using `WithIdleTimeout` dial option ([#6263](https://togithub.com/grpc/grpc-go/issues/6263)) - This feature is currently disabled by default, but will be enabled with a 30 minute default in the future. - client: when using pickfirst, keep channel state in TRANSIENT_FAILURE until it becomes READY ([gRFC A62](https://togithub.com/grpc/proposal/blob/master/A62-pick-first.md)) ([#6306](https://togithub.com/grpc/grpc-go/issues/6306)) - xds: Add support for Custom LB Policies ([gRFC A52](https://togithub.com/grpc/proposal/blob/master/A52-xds-custom-lb-policies.md)) ([#6224](https://togithub.com/grpc/grpc-go/issues/6224)) - xds: support pick_first Custom LB policy ([gRFC A62](https://togithub.com/grpc/proposal/blob/master/A62-pick-first.md)) ([#6314](https://togithub.com/grpc/grpc-go/issues/6314)) ([#6317](https://togithub.com/grpc/grpc-go/issues/6317)) - client: add support for pickfirst address shuffling ([gRFC A62](https://togithub.com/grpc/proposal/blob/master/A62-pick-first.md)) ([#6311](https://togithub.com/grpc/grpc-go/issues/6311)) - xds: Add support for String Matcher Header Matcher in RDS ([#6313](https://togithub.com/grpc/grpc-go/issues/6313)) - xds/outlierdetection: Add Channelz Logger to Outlier Detection LB ([#6145](https://togithub.com/grpc/grpc-go/issues/6145)) - Special Thanks: [@s-matyukevich](https://togithub.com/s-matyukevich) - xds: enable RLS in xDS by default ([#6343](https://togithub.com/grpc/grpc-go/issues/6343)) - orca: add support for application_utilization field and missing range checks on several metrics setters - balancer/weightedroundrobin: add new LB policy for balancing between backends based on their load reports ([gRFC A58](https://togithub.com/grpc/proposal/blob/master/A58-client-side-weighted-round-robin-lb-policy.md)) ([#6241](https://togithub.com/grpc/grpc-go/issues/6241)) - authz: add conversion of json to RBAC Audit Logging config ([#6192](https://togithub.com/grpc/grpc-go/issues/6192)) - authz: add support for stdout logger ([#6230](https://togithub.com/grpc/grpc-go/issues/6230) and [#6298](https://togithub.com/grpc/grpc-go/issues/6298)) - authz: support customizable audit functionality for authorization policy ([#6192](https://togithub.com/grpc/grpc-go/issues/6192) [#6230](https://togithub.com/grpc/grpc-go/issues/6230)Â [#6298](https://togithub.com/grpc/grpc-go/issues/6298) [#6158](https://togithub.com/grpc/grpc-go/issues/6158) [#6304](https://togithub.com/grpc/grpc-go/issues/6304) and [#6225](https://togithub.com/grpc/grpc-go/issues/6225)) ### Bug Fixes - orca: fix a race at startup of out-of-band metric subscriptions that would cause the report interval to request 0 ([#6245](https://togithub.com/grpc/grpc-go/issues/6245)) - xds/xdsresource: Fix Outlier Detection Config Handling and correctly set xDS Defaults ([#6361](https://togithub.com/grpc/grpc-go/issues/6361)) - xds/outlierdetection: Fix Outlier Detection Config Handling by setting defaults in ParseConfig() ([#6361](https://togithub.com/grpc/grpc-go/issues/6361)) ### API Changes - orca: allow a ServerMetricsProvider to be passed to the ORCA service and ServerOption ([#6223](https://togithub.com/grpc/grpc-go/issues/6223)) ### [`v1.55.1`](https://togithub.com/grpc/grpc-go/releases/tag/v1.55.1): Release 1.55.1 [Compare Source](https://togithub.com/grpc/grpc-go/compare/v1.55.0...v1.55.1) - status: To fix a panic, `status.FromError` now returns an error with `codes.Unknown` when the error implements the `GRPCStatus()` method, and calling `GRPCStatus()` returns `nil`. ([#6374](https://togithub.com/grpc/grpc-go/issues/6374)) ### [`v1.55.0`](https://togithub.com/grpc/grpc-go/releases/tag/v1.55.0): Release 1.55.0 [Compare Source](https://togithub.com/grpc/grpc-go/compare/v1.54.1...v1.55.0) ### Behavior Changes - xds: enable federation support by default ([#6151](https://togithub.com/grpc/grpc-go/issues/6151)) - status: `status.Code` and `status.FromError` handle wrapped errors ([#6031](https://togithub.com/grpc/grpc-go/issues/6031) and [#6150](https://togithub.com/grpc/grpc-go/issues/6150)) - Special Thanks: [@psyhatter](https://togithub.com/psyhatter) ### New Features - xds/xdsclient: support `ignore_resource_deletion` server feature as per gRFC [A53](https://togithub.com/grpc/proposal/blob/master/A53-xds-ignore-resource-deletion.md) ([#6035](https://togithub.com/grpc/grpc-go/issues/6035)) - security/advancedtls: add min/max TLS version selection options ([#6007](https://togithub.com/grpc/grpc-go/issues/6007)) - Special Thanks: [@joeljeske](https://togithub.com/joeljeske) ### Bug Fixes - xds: stop routing RPCs to deleted clusters ([#6125](https://togithub.com/grpc/grpc-go/issues/6125)) - client: fix race between stream creation and GOAWAY receipt, which could lead to spurious UNAVAILABLE stream errors ([#6142](https://togithub.com/grpc/grpc-go/issues/6142)) ### Performance Improvements - server: improve stream handler goroutine worker allocation when [`NumStreamWorkers`](https://pkg.go.dev/google.golang.org/grpc#NumStreamWorkers) is used ([#6004](https://togithub.com/grpc/grpc-go/issues/6004)) - Special Thanks: [@SaveTheRbtz](https://togithub.com/SaveTheRbtz) ### [`v1.54.1`](https://togithub.com/grpc/grpc-go/releases/tag/v1.54.1): Release 1.54.1 [Compare Source](https://togithub.com/grpc/grpc-go/compare/v1.54.0...v1.54.1) ### Bug Fixes - credentials/alts: revert a change that causes a crash in the handshaker ### [`v1.54.0`](https://togithub.com/grpc/grpc-go/releases/tag/v1.54.0): Release 1.54.0 [Compare Source](https://togithub.com/grpc/grpc-go/compare/v1.53.0...v1.54.0) ### Behavior Changes - xds: remove support for xDS v2 transport API ([#6013](https://togithub.com/grpc/grpc-go/issues/6013)) ### New Features - server: expose `SetSendCompressor` API to set send compressor name ([#5744](https://togithub.com/grpc/grpc-go/issues/5744)) - Special Thanks: [@jronak](https://togithub.com/jronak) - xdsclient: include `Node` proto only in the first discovery request message, to improve performance ([#6078](https://togithub.com/grpc/grpc-go/issues/6078)) ### Bug Fixes - metadata: fix validation logic and properly validate metadata appended via `AppendToOutgoingContext` ([#6001](https://togithub.com/grpc/grpc-go/issues/6001)) - Special Thanks: [@ktalg](https://togithub.com/ktalg) - transport: do not close connections when we encounter I/O errors until after all data is consumed ([#6110](https://togithub.com/grpc/grpc-go/issues/6110)) - ringhash: ensure addresses are consistently hashed across updates ([#6066](https://togithub.com/grpc/grpc-go/issues/6066)) - xds/clusterimpl: fix a bug causing unnecessary closing and re-opening of LRS streams ([#6112](https://togithub.com/grpc/grpc-go/issues/6112)) - xds: NACK route configuration if sum of weights of weighted clusters exceeds uint32\_max ([#6085](https://togithub.com/grpc/grpc-go/issues/6085)) ### Documentation - resolver: update `Resolver.Scheme()` docstring to mention requirement of lowercase scheme names ([#6014](https://togithub.com/grpc/grpc-go/issues/6014)) - resolver: document expected error handling of `UpdateState` errors ([#6002](https://togithub.com/grpc/grpc-go/issues/6002)) - Special Thanks: [@fho](https://togithub.com/fho) - examples: add example for ORCA load reporting ([#6114](https://togithub.com/grpc/grpc-go/issues/6114)) - examples: add an example to illustrate authorization (authz) support ([#5920](https://togithub.com/grpc/grpc-go/issues/5920)) - Special Thanks: [@KenxinKun](https://togithub.com/KenxinKun) ### [`v1.53.0`](https://togithub.com/grpc/grpc-go/releases/tag/v1.53.0): Release 1.53.0 [Compare Source](https://togithub.com/grpc/grpc-go/compare/v1.52.3...v1.53.0) ### API Changes - balancer: support injection of per-call metadata from LB policies ([#5853](https://togithub.com/grpc/grpc-go/issues/5853)) - resolver: remove deprecated field `resolver.Target.Endpoint` and replace with `resolver.Target.Endpoint()` ([#5852](https://togithub.com/grpc/grpc-go/issues/5852)) - Special Thanks: [@kylejb](https://togithub.com/kylejb) ### New Features - xds/ringhash: introduce `GRPC_RING_HASH_CAP` environment variable to override the maximum ring size. ([#5884](https://togithub.com/grpc/grpc-go/issues/5884)) - rls: propagate headers received in RLS response to backends ([#5883](https://togithub.com/grpc/grpc-go/issues/5883)) ### Bug Fixes - transport: drain client transport when streamID approaches MaxStreamID ([#5889](https://togithub.com/grpc/grpc-go/issues/5889)) - server: after GracefulStop, ensure connections are closed when final RPC completes ([#5968](https://togithub.com/grpc/grpc-go/issues/5968)) - server: fix a few issues where grpc server uses RST_STREAM for non-HTTP/2 errors ([#5893](https://togithub.com/grpc/grpc-go/issues/5893)) - xdsclient: fix race which can happen when multiple load reporting calls are made at the same time. ([#5927](https://togithub.com/grpc/grpc-go/issues/5927)) - rls: fix a data race involving the LRU cache ([#5925](https://togithub.com/grpc/grpc-go/issues/5925)) - xds: fix panic involving double close of channel in xDS transport ([#5959](https://togithub.com/grpc/grpc-go/issues/5959)) - gcp/observability: update method name validation ([#5951](https://togithub.com/grpc/grpc-go/issues/5951)) ### Documentation - credentials/oauth: mark `NewOauthAccess` as deprecated ([#5882](https://togithub.com/grpc/grpc-go/issues/5882)) - Special Thanks: [@buzzsurfr](https://togithub.com/buzzsurfr) ### [`v1.52.3`](https://togithub.com/grpc/grpc-go/releases/tag/v1.52.3): Release 1.52.3 [Compare Source](https://togithub.com/grpc/grpc-go/compare/v1.52.1...v1.52.3) ### Bug Fixes - Fix user-agent version ### [`v1.52.1`](https://togithub.com/grpc/grpc-go/releases/tag/v1.52.1): Release 1.52.1 [Compare Source](https://togithub.com/grpc/grpc-go/compare/v1.52.0...v1.52.1) ### Bug Fixes - grpclb: rename grpclbstate package back to state ([#5963](https://togithub.com/grpc/grpc-go/issues/5963)) ### [`v1.52.0`](https://togithub.com/grpc/grpc-go/releases/tag/v1.52.0): Release 1.52.0 [Compare Source](https://togithub.com/grpc/grpc-go/compare/v1.51.0...v1.52.0) ### New Features - xdsclient: log node ID with verbosity INFO ([#5860](https://togithub.com/grpc/grpc-go/issues/5860)) - ringhash: impose cap on `max_ring_size` to reduce possibility of OOMs ([#5801](https://togithub.com/grpc/grpc-go/issues/5801)) ### Behavior Changes - client: return an error from `Dial` if an empty target is passed and no custom dialer is present; the ClientConn would otherwise be unable to connect and perform RPCs ([#5732](https://togithub.com/grpc/grpc-go/issues/5732)) - Special Thanks: [@huangchong94](https://togithub.com/huangchong94) ### Bug Fixes - transport (net/http server handler): respond to bad HTTP requests with status 400 (Bad Request) instead of 500 (Internal Server Error). ([#5804](https://togithub.com/grpc/grpc-go/issues/5804)) - Special Thanks: [@sjbarag](https://togithub.com/sjbarag) - transport: Fixed closing a closed channel panic in handlePing ([#5854](https://togithub.com/grpc/grpc-go/issues/5854)) - server: fix ChainUnaryInterceptor and ChainStreamInterceptor to allow retrying handlers ([#5666](https://togithub.com/grpc/grpc-go/issues/5666)) - Special Thanks: [@yiminc](https://togithub.com/yiminc) - transport: ensure value of `:authority` header matches server name used in TLS handshake when the latter is overridden by the name resolver ([#5748](https://togithub.com/grpc/grpc-go/issues/5748)) - Special Thanks: [@holdno](https://togithub.com/holdno) ### Documentation - examples: add an example to illustrate the usage of stats handler ([#5657](https://togithub.com/grpc/grpc-go/issues/5657)) - Special Thanks: [@Yash-Handa](https://togithub.com/Yash-Handa) - examples: add new example to show updating metadata in interceptors ([#5788](https://togithub.com/grpc/grpc-go/issues/5788)) - Special Thanks: [@richzw](https://togithub.com/richzw) ### [`v1.51.0`](https://togithub.com/grpc/grpc-go/releases/tag/v1.51.0): Release 1.51.0 [Compare Source](https://togithub.com/grpc/grpc-go/compare/v1.50.1...v1.51.0) ##### Behavior Changes - xds: NACK EDS resources with duplicate addresses in accordance with a recent spec change ([#5715](https://togithub.com/grpc/grpc-go/issues/5715)) - Special Thanks: [@erni27](https://togithub.com/erni27) - grpc: restrict status codes that can be generated by the control plane (gRFC A54) ([#5653](https://togithub.com/grpc/grpc-go/issues/5653)) ##### New Features - client: set grpc-accept-encoding header with all registered compressors ([#5541](https://togithub.com/grpc/grpc-go/issues/5541)) - Special Thanks: [@jronak](https://togithub.com/jronak) - xds/weightedtarget: return a more meaningful error when all child policies are in `TRANSIENT_FAILURE` ([#5711](https://togithub.com/grpc/grpc-go/issues/5711)) - gcp/observability: add "started rpcs" metric ([#5768](https://togithub.com/grpc/grpc-go/issues/5768)) - xds: de-experimentalize the google-c2p-resolver ([#5707](https://togithub.com/grpc/grpc-go/issues/5707)) - balancer: add experimental Producer types and methods ([#5669](https://togithub.com/grpc/grpc-go/issues/5669)) - orca: provide a way for LB policies to receive OOB load reports ([#5669](https://togithub.com/grpc/grpc-go/issues/5669)) ##### Bug Fixes - go.mod: upgrade x/text dependency to address [CVE 2022-32149](https://www.cve.org/CVERecord?id=CVE-2022-32149) ([#5769](https://togithub.com/grpc/grpc-go/issues/5769)) - client: fix race that could lead to an incorrect connection state if it was closed immediately after the server's HTTP/2 preface was received ([#5714](https://togithub.com/grpc/grpc-go/issues/5714)) - Special Thanks: [@fuweid](https://togithub.com/fuweid) - xds: ensure sum of the weights of all EDS localities at the same priority level does not exceed uint32 max ([#5703](https://togithub.com/grpc/grpc-go/issues/5703)) - Special Thanks: [@erni27](https://togithub.com/erni27) - client: fix binary logging bug which logs a server header on a trailers-only response ([#5763](https://togithub.com/grpc/grpc-go/issues/5763)) - balancer/priority: fix a bug where unreleased references to removed child policies (and associated state) was causing a memory leak ([#5682](https://togithub.com/grpc/grpc-go/issues/5682)) - xds/google-c2p: validate URI schema for no authorities ([#5756](https://togithub.com/grpc/grpc-go/issues/5756)) ### [`v1.50.1`](https://togithub.com/grpc/grpc-go/releases/tag/v1.50.1): Release 1.50.1 [Compare Source](https://togithub.com/grpc/grpc-go/compare/v1.50.0...v1.50.1) New Features - gcp/observability: support new configuration defined in public preview user guide ### [`v1.50.0`](https://togithub.com/grpc/grpc-go/releases/tag/v1.50.0): Release 1.50.0 [Compare Source](https://togithub.com/grpc/grpc-go/compare/v1.49.0...v1.50.0) ### Behavior Changes - client: use proper "@" semantics for connecting to abstract unix sockets. ([#5678](https://togithub.com/grpc/grpc-go/issues/5678)) - This is technically a bug fix; the result is that the address was including a trailing NULL byte, which it should not have. This may break users creating the socket in Go by prefixing a NULL instead of an "@", though, so calling it out as a behavior change. - Special Thanks: [@jachor](https://togithub.com/jachor) ### New Features - metadata: add experimental `ValueFromIncomingContext` to more efficiently retrieve a single value ([#5596](https://togithub.com/grpc/grpc-go/issues/5596)) - Special Thanks: [@horpto](https://togithub.com/horpto) - stats: provide peer information in `HandleConn` context ([#5589](https://togithub.com/grpc/grpc-go/issues/5589)) - Special Thanks: [@feihu-stripe](https://togithub.com/feihu-stripe) - xds: add support for Outlier Detection, enabled by default ([#5435](https://togithub.com/grpc/grpc-go/issues/5435), [#5673](https://togithub.com/grpc/grpc-go/issues/5673)) ### Bug Fixes - client: fix deadlock in transport caused by GOAWAY racing with stream creation ([#5652](https://togithub.com/grpc/grpc-go/issues/5652)) - This should only occur with an HTTP/2 server that does not follow best practices of an advisory GOAWAY (not a grpc-go server). - xds/xdsclient: fix a bug which was causing routes with `cluster_specifier_plugin` set to be NACKed when GRPC_EXPERIMENTAL_XDS_RLS_LB was off ([#5670](https://togithub.com/grpc/grpc-go/issues/5670)) - xds/xdsclient: NACK cluster resource if `config_source_specifier` in `lrs_server` is not `self` ([#5613](https://togithub.com/grpc/grpc-go/issues/5613)) - xds/ringhash: fix a bug which sometimes prevents the LB policy from retrying connection attempts ([#5601](https://togithub.com/grpc/grpc-go/issues/5601)) - xds/ringhash: do nothing when asked to exit `IDLE` instead of falling back on the default channel behavior of connecting to all addresses ([#5614](https://togithub.com/grpc/grpc-go/issues/5614)) - xds/rls: fix a bug which was causing the channel to be stuck in `IDLE` ([#5656](https://togithub.com/grpc/grpc-go/issues/5656)) - alts: fix a bug which was setting `WaitForReady` on handshaker service RPCs, thereby delaying fallback when required ([#5620](https://togithub.com/grpc/grpc-go/issues/5620)) - gcp/observability: fix End() to cleanup global state correctly ([#5623](https://togithub.com/grpc/grpc-go/issues/5623)) ### [`v1.49.0`](https://togithub.com/grpc/grpc-go/releases/tag/v1.49.0): Release 1.49.0 [Compare Source](https://togithub.com/grpc/grpc-go/compare/v1.48.0...v1.49.0) ### New Features - gcp/observability: add support for Environment Variable `GRPC_CONFIG_OBSERVABILITY_JSON` ([#5525](https://togithub.com/grpc/grpc-go/issues/5525)) - gcp/observability: add support for custom tags ([#5565](https://togithub.com/grpc/grpc-go/issues/5565)) ### Behavior Changes - server: reduce log level from Warning to Info for early connection establishment errors ([#5524](https://togithub.com/grpc/grpc-go/issues/5524)) - Special Thanks: [@jpkrohling](https://togithub.com/jpkrohling) ### Bug Fixes - client: fix race in flow control that could lead to unexpected EOF errors ([#5494](https://togithub.com/grpc/grpc-go/issues/5494)) - client: fix a race that could cause RPCs to time out instead of failing more quickly with UNAVAILABLE ([#5503](https://togithub.com/grpc/grpc-go/issues/5503)) - client & server: fix a panic caused by passing a `nil` stats handler to `grpc.WithStatsHandler` or `grpc.StatsHandler` ([#5543](https://togithub.com/grpc/grpc-go/issues/5543)) - transport/server: fix a race that could cause a stray header to be sent ([#5513](https://togithub.com/grpc/grpc-go/issues/5513)) - balancer: give precedence to `IDLE` over `TRANSIENT_FAILURE` when aggregating connectivity state ([#5473](https://togithub.com/grpc/grpc-go/issues/5473)) - xds/xdsclient: request correct resource name when user specifies a new style resource name with empty authority ([#5488](https://togithub.com/grpc/grpc-go/issues/5488)) - xds/xdsclient: NACK endpoint resources with zero weight ([#5560](https://togithub.com/grpc/grpc-go/issues/5560)) - xds/xdsclient: fix bug that would reset resource version information after ADS stream restart ([#5422](https://togithub.com/grpc/grpc-go/issues/5422)) - xds/xdsclient: fix goroutine leaks when load reporting is enabled ([#5505](https://togithub.com/grpc/grpc-go/issues/5505)) - xds/ringhash: fix config update processing to recreate ring and picker when min/max ring size changes ([#5557](https://togithub.com/grpc/grpc-go/issues/5557)) - xds/ringhash: avoid recreating subChannels when update doesn't change address weight information ([#5431](https://togithub.com/grpc/grpc-go/issues/5431)) - xds/priority: fix bug which could cause priority LB to block all traffic after a config update ([#5549](https://togithub.com/grpc/grpc-go/issues/5549)) - xds: fix bug when environment variable `GRPC_EXPERIMENTAL_ENABLE_OUTLIER_DETECTION` is set to true ([#5537](https://togithub.com/grpc/grpc-go/issues/5537)) ### [`v1.48.0`](https://togithub.com/grpc/grpc-go/releases/tag/v1.48.0): Release 1.48.0 [Compare Source](https://togithub.com/grpc/grpc-go/compare/v1.47.0...v1.48.0) ### Bug Fixes - xds/priority: fix bug that could prevent higher priorities from receiving config updates ([#5417](https://togithub.com/grpc/grpc-go/issues/5417)) - RLS load balancer: don't propagate the status code returned on control plane RPCs to data plane RPCs ([#5400](https://togithub.com/grpc/grpc-go/issues/5400)) ### New Features - stats: add support for multiple stats handlers in a single client or server ([#5347](https://togithub.com/grpc/grpc-go/issues/5347)) - gcp/observability: add experimental OpenCensus tracing/metrics support ([#5372](https://togithub.com/grpc/grpc-go/issues/5372)) - xds: enable aggregate and logical DNS clusters by default ([#5380](https://togithub.com/grpc/grpc-go/issues/5380)) - credentials/google (for xds): support xdstp C2P cluster names ([#5399](https://togithub.com/grpc/grpc-go/issues/5399))Configuration
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