{"schema_version":"1.7.3","id":"GHSA-846p-jg2w-w324","published":"2026-01-21T16:19:28Z","modified":"2026-08-07T08:11:50.697921505Z","aliases":["CVE-2026-23991","GO-2026-4348"],"related":["CGA-65px-f3jm-g5jx"],"summary":"go-tuf affected by client DoS via malformed server response","details":"# Security Disclosure: Client DoS via malformed server response\n\n## Summary\n\nIf the TUF repository (or any of its mirrors) returns invalid TUF metadata JSON (valid JSON but not well formed TUF metadata), the client will panic _during parsing_, causing a DoS. The panic happens before any signature is validated. This means that a compromised repository/mirror/cache can DoS clients without having access to any signing key.\n\n## Impact \n\nClient crashes upon receiving and parsing malformed TUF metadata. This can cause long running services to enter an restart/crash loop.\n\n## Workarounds\n\nNone currently. \n\n## Affected code\n\nThe `metadata.checkType` function did not properly type assert the (untrusted) input causing it to panic on malformed data.","affected":[{"package":{"name":"github.com/theupdateframework/go-tuf/v2","ecosystem":"Go","purl":"pkg:golang/github.com/theupdateframework/go-tuf/v2"},"ranges":[{"type":"SEMVER","events":[{"introduced":"0"},{"fixed":"2.3.1"}]}],"database_specific":{"source":"https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/01/GHSA-846p-jg2w-w324/GHSA-846p-jg2w-w324.json"}}],"references":[{"type":"WEB","url":"https://github.com/theupdateframework/go-tuf/security/advisories/GHSA-846p-jg2w-w324"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-23991"},{"type":"WEB","url":"https://github.com/theupdateframework/go-tuf/commit/73345ab6b0eb7e59d525dac17a428f043074cef6"},{"type":"PACKAGE","url":"https://github.com/theupdateframework/go-tuf"},{"type":"WEB","url":"https://github.com/theupdateframework/go-tuf/releases/tag/v2.3.1"}],"database_specific":{"cwe_ids":["CWE-617","CWE-754"],"github_reviewed":true,"github_reviewed_at":"2026-01-21T16:19:28Z","nvd_published_at":"2026-01-22T03:15:47Z","severity":"MODERATE"},"severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H"}]}