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It allows someone with access to a valid signing key to create multiple valid signatures in order to circumvent TUF requiring a minimum threshold of unique keys before the metadata is considered valid.\n\nAWS would like to thank Erick Tryzelaar of the Google Fuchsia Team for reporting this issue. \n\n## Patches\n\nA fix is available in version 0.7.1.\n\n## Workarounds\n\nNo workarounds to this issue are known.\n\n## References\n\nCVE-2020-6174 is assigned to the same issue in the TUF reference implementation.\n\nhttps://github.com/theupdateframework/tuf/pull/974\nhttps://nvd.nist.gov/vuln/detail/CVE-2020-6174\n\n## For more information\n\nIf you have any questions or comments about this advisory, [contact AWS Security](https://aws.amazon.com/security/vulnerability-reporting/) at [aws-security@amazon.com](mailto:aws-security@amazon.com).","state":0,"publishedAt":"2021-08-25T20:56:55+00:00","modifiedAt":"2026-07-08T06:29:16.8755628+00:00","affected":[{"ecosystem":"crates.io","name":"tough","ranges":[{"type":"SEMVER","events":[{"kind":"introduced","version":"0"},{"kind":"fixed","version":"0.7.1"}]}],"versions":[],"rawVersionEvidence":null}],"metrics":[{"system":"CVSS_V3","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:H/A:N","score":null,"severity":null},{"system":"Publisher rating","vector":null,"score":null,"severity":"HIGH"}],"references":["https://github.com/awslabs/tough/security/advisories/GHSA-5q2r-92f9-4m49","https://nvd.nist.gov/vuln/detail/CVE-2020-15093","https://github.com/theupdateframework/tuf/pull/974","https://github.com/theupdateframework/tuf/commit/2977188139d065ff3356c3cb4aec60c582b57e0e","https://github.com/awslabs/tough","https://rustsec.org/advisories/RUSTSEC-2020-0024.html"],"sourceUrl":"https://github.com/advisories/GHSA-5q2r-92f9-4m49","license":"GitHub Advisory Database · CC-BY-4.0","key":"osv:GHSA-5q2r-92f9-4m49","identifiers":["GHSA-5q2r-92f9-4m49","CVE-2020-15093","RUSTSEC-2020-0024"]},"retained":false,"historicalAffected":[]},{"revision":"85221f4614ce4d93b47c4379ebb33770","observedAt":"2026-10-24T13:19:54.901+00:00","statement":{"source":"osv","id":"RUSTSEC-2020-0024","aliases":["CVE-2020-15093","GHSA-5q2r-92f9-4m49"],"title":"Improper uniqueness verification of signature threshold","description":"The tough library, prior to 0.7.1, does not properly verify the uniqueness of\nkeys in the signatures provided to meet the threshold of cryptographic\nsignatures. 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