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It allows someone with write access to the metadata to serve expired or otherwise invalid targets from a TUF repository which tough will then trust rather than reject.\n\n### Impacted Versions: \ntough 0.9.0 through 0.21.x, tuftool through 0.14.x\n\n### Patches\nThis issue has been addressed in tough version 0.22.0 and tuftool version 0.15.0. We recommend upgrading to the latest version and ensuring any forked or derivative code is patched to incorporate the new fixes. \n\n### Workarounds\nNo workarounds to this issue are known.\n\n### References\n* CVE-2026-6967\nIf there are any questions or comments about this advisory, please contact [AWS/Amazon] Security via the [vulnerability reporting page](https://aws.amazon.com/security/vulnerability-reporting) or directly via email to [aws-security@amazon.com](mailto:aws-security@amazon.com). Please do not create a public GitHub issue.\n\n### Acknowledgement\n\nAmazon Web Services Labs would like to thank Oleh Konko of 1seal for collaborating on this issue through the coordinated vulnerability disclosure process.","state":0,"publishedAt":"2026-05-05T18:46:48+00:00","modifiedAt":"2026-09-10T03:51:04.6646764+00:00","affected":[{"ecosystem":"crates.io","name":"tough","ranges":[{"type":"SEMVER","events":[{"kind":"introduced","version":"0.9.0"},{"kind":"fixed","version":"0.22.0"}]}],"versions":[],"rawVersionEvidence":null},{"ecosystem":"crates.io","name":"tuftool","ranges":[{"type":"SEMVER","events":[{"kind":"introduced","version":"0"},{"kind":"fixed","version":"0.15.0"}]}],"versions":[],"rawVersionEvidence":null}],"metrics":[{"system":"CVSS_V3","vector":"CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:N/I:H/A:L","score":null,"severity":null},{"system":"CVSS_V4","vector":"CVSS:4.0/AV:N/AC:H/AT:P/PR:L/UI:N/VC:N/VI:H/VA:N/SC:N/SI:H/SA:L","score":null,"severity":null},{"system":"Publisher rating","vector":null,"score":null,"severity":"HIGH"}],"references":["https://github.com/awslabs/tough/security/advisories/GHSA-4v58-8p28-2rq3","https://nvd.nist.gov/vuln/detail/CVE-2026-6967","https://aws.amazon.com/security/security-bulletins/2026-019-aws","https://crates.io/crates/tough/0.22.0","https://crates.io/crates/tuftool/0.15.0","https://github.com/awslabs/tough","https://github.com/awslabs/tough/releases/tag/tough-v0.22.0","https://github.com/awslabs/tough/releases/tag/tuftool-v0.15.0"],"sourceUrl":"https://github.com/advisories/GHSA-4v58-8p28-2rq3","license":"GitHub Advisory Database · CC-BY-4.0","key":"osv:GHSA-4v58-8p28-2rq3","identifiers":["GHSA-4v58-8p28-2rq3","CVE-2026-6967"]},"retained":false,"historicalAffected":[]}],"coverage":[{"source":"cisa-kev:global","scope":"Complete CISA KEV catalog; all vendors. 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