{"id":"GHSA-cp57-fq8g-qh6v","aliases":["RUSTSEC-2026-0077"],"url":"https://o3.security/vulnerability/GHSA-cp57-fq8g-qh6v","summary":"libcrux has an Incorrect Check of Signer Response Norm During Verification","details":"The ML-DSA verification algorithm as specified in [FIPS 204, subsection 6.3](https://nvlpubs.nist.gov/nistpubs/FIPS/NIST.FIPS.204.pdf#subsection.6.3) requires verifiers to check that the infinity norm of the deserialized signer response $z$ does not exceed $\\gamma_1 - \\beta$ (line 13 of Algorithm 8). The same check is required to be performed during signature generation.\n\nlibcrux-ml-dsa did not perform this check correctly during signature verification, accepting signatures with signer response norm above the allowed maximum value. The check is correctly performed during signing.\n\n## Impact\nApplications using libcrux-ml-dsa for signature verification would have accepted signatures that would be rejected by a conforming implementation.\n\n## Mitigation\nStarting from version `0.0.8`, signature verification uses the correct value for $\\gamma_1$ in the signer response norm check.","published":"2026-03-26T18:00:28Z","modified":"2026-03-27T06:11:21.668298Z","cvss":null,"epss":null,"cisaKev":null,"exploitsKnown":0,"affectedPackages":[{"ecosystem":"crates.io","name":"libcrux-ml-dsa","fixedVersion":"0.0.8"}],"fix":{"url":"https://github.com/cryspen/libcrux/pull/1347","label":"cryspen/libcrux#1347"},"references":[{"type":"WEB","url":"https://github.com/cryspen/libcrux/pull/1347"},{"type":"PACKAGE","url":"https://github.com/cryspen/libcrux"},{"type":"WEB","url":"https://rustsec.org/advisories/RUSTSEC-2026-0077.html"}],"provenance":{"sources":["OSV.dev","FIRST.org (EPSS)"],"lastVerified":"2026-03-27T06:11:21.668298Z"}}