GHSA-3w94-vq2x-v5wr

### Impact Prior to `ethereum` crate v0.18.0, signature malleability (according to EIP-2) was only checked for "legacy" transactions, but not for EIP-2930, EIP-1559 and EIP-7702 transactions. This is a specification deviation and therefore a high severity advisory if the `ethereum` crate is used for Ethereum mainnet. Note that signature malleability itself is not a security issue, and therefore if the `ethereum` crate is used on a single-implementation blockchain, it's a low/informational severity advisory. ### Patches The issue is fixed in `ethereum` v0.18.0 ### Workarounds You can also manually check transaction malleability outside of the crate. But it's recommended to simply upgrade the version. ### References See PR: https://github.com/rust-ethereum/ethereum/pull/67