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.
The issue is fixed in ethereum v0.18.0
You can also manually check transaction malleability outside of the crate. But it's recommended to simply upgrade the version.
{
"cwe_ids": [
"CWE-754"
],
"github_reviewed": true,
"github_reviewed_at": "2025-07-02T15:12:18Z",
"nvd_published_at": "2025-07-02T16:15:29Z",
"severity": "MODERATE"
}