Mitigation Confirmed for Mitigation of H-06: Issue mitigated with error

[code423n4]

Mitigated issue

H-06: WstEth derivative assumes a ~1=1 peg of stETH to ETH.

The issue was that WstEth.withdraw() and WstEth.ethPerDerivative() assume a perfect peg between stETH and ETH, which may cause the slippage to be inaccurately evaluated.

Mitigation review

The issue has been mitigated by using the Chainlink stETH/ETH price feed to get the price of stETH instead of implicitly assuming a peg. Negative prices are set to 0 by if (chainLinkStEthEthPrice < 0) chainLinkStEthEthPrice = 0;. While it seems all but impossible that the price would ever be negative, if it was it doesn't seem to make sense to assume that it's 0. Just letting the conversion revert would make more sense. But this is almost surely not going to happen.

Mitigation error: No sanity check on Chainlink response

There are no sanity checks on the Chainlink price feed return data, especially that it is not stale. Here is an overview on this matter. See the error report on this titled "[H-02, H-05, H-06, H-08] mitigation error: No sanity check on Chainlink price feed".

[c4-judge]

Picodes marked the issue as satisfactory

[c4-judge]

Picodes marked the issue as nullified

[Picodes]

Nullified as the issue as actually not been mitigated as shown by the 2 other reports