{"id":"CVE-2026-6966","aliases":["GHSA-8m7c-8m39-rv4x"],"url":"https://o3.security/vulnerability/CVE-2026-6966","summary":"Signature Threshold Bypass in awslabs/tough Delegated Roles","details":"Improper verification of cryptographic signature uniqueness in delegated role validation in awslabs/tough before tough-v0.22.0 allows remote authenticated users to bypass the TUF signature threshold requirement by duplicating a valid signature, causing the client to accept forged delegated role metadata.\n\nWe recommend you upgrade to tough-v0.22.0 / tuftool-v0.15.0.","published":"2026-04-24T19:38:24.907Z","modified":"2026-08-05T03:32:19.109207567Z","cvss":null,"epss":null,"cisaKev":null,"exploitsKnown":0,"affectedPackages":[{"ecosystem":"crates.io","name":"tough","fixedVersion":"0.22.0"},{"ecosystem":"crates.io","name":"tuftool","fixedVersion":"0.15.0"}],"fix":null,"references":[{"type":"ADVISORY","url":"https://aws.amazon.com/security/security-bulletins/2026-019-aws/"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/6xxx/CVE-2026-6966.json"},{"type":"ADVISORY","url":"https://github.com/awslabs/tough/security/advisories/GHSA-8m7c-8m39-rv4x"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-6966"},{"type":"FIX","url":"https://crates.io/crates/tough/0.22.0"},{"type":"FIX","url":"https://crates.io/crates/tuftool/0.15.0"},{"type":"FIX","url":"https://github.com/awslabs/tough/releases/tag/tough-v0.22.0"},{"type":"FIX","url":"https://github.com/awslabs/tough/releases/tag/tuftool-v0.15.0"}],"provenance":{"sources":["OSV.dev","FIRST.org (EPSS)"],"lastVerified":"2026-08-05T03:32:19.109207567Z"}}