{"id":"CVE-2026-23992","aliases":["GHSA-fphv-w9fq-2525","GO-2026-4349"],"url":"https://o3.security/vulnerability/CVE-2026-23992","summary":"go-tuf improperly validates the configured threshold for delegations","details":"# Security Disclosure: Improper validation of configured threshold for delegations\n\n## Summary\n\nA compromised or misconfigured TUF repository can have the configured value of signature thresholds set to 0, which effectively disables signature verification. \n\n## Impact\n\nUnathorized modification to TUF metadata files is possible at rest, or during transit as no integrity checks are made.\n\n## Patches\n\nUpgrade to v2.3.1\n\n## Workarounds\n\nAlways make sure that the TUF metadata roles are configured with a threshold of at least 1.\n\n## Affected code:\n\nThe `metadata.VerifyDelegate` did not verify the configured threshold prior to comparison. This means that a misconfigured TUF repository could disable the signature verification by setting the threshold to 0, or a negative value (and so always make the signature threshold computation to pass).","published":"2026-01-22T02:20:06.845Z","modified":"2026-10-28T02:30:59.938286167Z","cvss":{"score":5.9,"severity":"MEDIUM","vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:N"},"epss":null,"cisaKev":null,"exploitsKnown":0,"affectedPackages":[{"ecosystem":"Go","name":"github.com/theupdateframework/go-tuf/v2","fixedVersion":"2.3.1"}],"fix":{"url":"https://github.com/theupdateframework/go-tuf/commit/b38d91fdbc69dfe31fe9230d97dafe527ea854a0","label":"theupdateframework/go-tuf@b38d91f"},"references":[{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/23xxx/CVE-2026-23992.json"},{"type":"ADVISORY","url":"https://github.com/theupdateframework/go-tuf/security/advisories/GHSA-fphv-w9fq-2525"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-23992"},{"type":"FIX","url":"https://github.com/theupdateframework/go-tuf/commit/b38d91fdbc69dfe31fe9230d97dafe527ea854a0"},{"type":"PACKAGE","url":"https://github.com/theupdateframework/go-tuf"},{"type":"WEB","url":"https://github.com/theupdateframework/go-tuf/releases/tag/v2.3.1"}],"provenance":{"sources":["OSV.dev","FIRST.org (EPSS)"],"lastVerified":"2026-10-28T02:30:59.938286167Z"}}