{"id":"GHSA-fhvh-vw7h-9xf3","summary":" libcrux-ml-dsa: Signature Verification on AVX2 Platforms Mishandles Edge Case","details":"The AVX2 implementation of ML-DSA verification incorrectly implemented\nthe `use_hint` function, mishandling an edge case that should lead to\nsignature rejection.\n\n## Impact\nAn attacker could make the ML-DSA verifier accept a crafted invalid\nsignature under a maliciously generated verification key, if the AVX2\nimplementation is used.\n\n## Mitigation\nFrom version `0.0.9` the edge case is handled correctly and invalid\nsignatures are rejected.","aliases":["RUSTSEC-2026-0125"],"modified":"2026-05-20T07:26:23.879990746Z","published":"2026-05-19T16:18:53Z","database_specific":{"cwe_ids":["CWE-347"],"severity":"HIGH","github_reviewed":true,"github_reviewed_at":"2026-05-19T16:18:53Z","nvd_published_at":null},"references":[{"type":"WEB","url":"https://github.com/C2SP/wycheproof/pull/234"},{"type":"WEB","url":"https://github.com/cryspen/libcrux/pull/1398"},{"type":"WEB","url":"https://github.com/tink-crypto/tink-go/pull/48"},{"type":"PACKAGE","url":"https://github.com/cryspen/libcrux"},{"type":"WEB","url":"https://rustsec.org/advisories/RUSTSEC-2026-0125.html"}],"affected":[{"package":{"name":"libcrux-ml-dsa","ecosystem":"crates.io","purl":"pkg:cargo/libcrux-ml-dsa"},"ranges":[{"type":"SEMVER","events":[{"introduced":"0"},{"fixed":"0.0.9"}]}],"database_specific":{"source":"https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/05/GHSA-fhvh-vw7h-9xf3/GHSA-fhvh-vw7h-9xf3.json"}}],"schema_version":"1.9.0","severity":[{"type":"CVSS_V4","score":"CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N"}]}