{"id":"CVE-2026-6967","title":"Missing Delegated Metadata Validation in awslabs/tough","summary":"Missing expiration, hash, and length enforcement in delegated metadata validation in awslabs/tough before tough-v0.22.0 allows remote authenticated users with delegated signing authority to bypass TUF specification integrity checks for d…","severity":"medium","cvss":5.9,"cvssVector":"CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:N/I:H/A:L","cvssSource":"cna","cwe":["CWE-345"],"vendor":"AWS","product":"tough","affected":["tough >= 0.9.0 <= 0.21","tuftool <= 0.14"],"ssvc":{"exploitation":"none","automatable":"no","technicalImpact":"partial","timestamp":"2026-04-24T20:13:04.619106Z"},"published":"2026-04-24","updated":"2026-10-20","sourceUpdated":"2026-10-20T18:26:25.513Z","source":"CVEORG","sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-6967","references":[{"url":"https://aws.amazon.com/security/security-bulletins/2026-019-aws/"},{"url":"https://github.com/awslabs/tough/releases/tag/tough-v0.22.0"},{"url":"https://github.com/awslabs/tough/releases/tag/tuftool-v0.15.0"},{"url":"https://crates.io/crates/tough/0.22.0"},{"url":"https://crates.io/crates/tuftool/0.15.0"},{"url":"https://github.com/awslabs/tough/security/advisories/GHSA-4v58-8p28-2rq3"}],"tags":["cve.org"],"epss":0.00303,"epssPercentile":0.21636,"ingestedAt":"2026-10-20T19:16:14.549Z","slug":"CVE-2026-6967","body":"## Overview\n\nMissing expiration, hash, and length enforcement in delegated metadata validation in awslabs/tough before tough-v0.22.0 allows remote authenticated users with delegated signing authority to bypass TUF specification integrity checks for delegated targets metadata and poison the local metadata cache, because load_delegations does not apply the same validation checks as the top-level targets metadata path.\n\n\n\nWe recommend you upgrade to tough-v0.22.0 / tuftool-v0.15.0.\n\n## Affected\n\n- `tough >= 0.9.0 <= 0.21`\n- `tuftool <= 0.14`\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"sunlit","depthScore":33,"depthScoreParts":{"impact":32.5,"likelihood":0.1,"exploitation":0,"ransomware":0},"changes":[]}