{"id":"GHSA-xhq7-xmqj-769h","revision":"d895e45df9ff45fdbac4731556e3fc04","records":[{"revision":"d895e45df9ff45fdbac4731556e3fc04","observedAt":"2026-10-24T13:17:17.793+00:00","statement":{"source":"osv","id":"GHSA-xhq7-xmqj-769h","aliases":["CVE-2026-110095"],"title":"fast-uri vulnerable to improper path equivalence in relative reference normalization","description":"### Impact\n\n`fast-uri`'s `normalize()` and `serialize()` apply RFC 3986 dot-segment removal (`remove_dot_segments`) to the path of a relative-path reference. RFC 3986 section 5.2.4 defines that algorithm only for the merged target path during resolution, not for the reference itself, so applied to the reference it drops leading `..` segments and can turn a document-relative reference into a root-relative one.\n\nFor example, `normalize('a/../b')` returns `/b` and `normalize('../x')` returns `x`, so `resolve(base, normalize(ref))` points at a different resource than `resolve(base, ref)`, and `equal()` treats distinct references as the same.\n\nApplications that normalize attacker-supplied or user-supplied relative references and then resolve them, or use them as cache, deduplication, or authorization keys, can have a reference escape its intended directory and point at a different resource.\n\n### Patches\n\nUpgrade to `fast-uri` `2.4.8`, `3.1.9`, or `4.2.3`.\n\n### Workarounds\n\nDo not normalize a relative reference before resolving it. Resolve it against the absolute base first, then normalize the absolute result.","state":0,"publishedAt":"2026-10-23T21:39:34+00:00","modifiedAt":"2026-10-23T21:45:04.9023899+00:00","affected":[{"ecosystem":"npm","name":"fast-uri","ranges":[{"type":"SEMVER","events":[{"kind":"introduced","version":"0"},{"kind":"fixed","version":"2.4.8"}]}],"versions":[],"rawVersionEvidence":null},{"ecosystem":"npm","name":"fast-uri","ranges":[{"type":"SEMVER","events":[{"kind":"introduced","version":"3.0.0"},{"kind":"fixed","version":"3.1.9"}]}],"versions":[],"rawVersionEvidence":null},{"ecosystem":"npm","name":"fast-uri","ranges":[{"type":"SEMVER","events":[{"kind":"introduced","version":"4.0.0"},{"kind":"fixed","version":"4.2.3"}]}],"versions":[],"rawVersionEvidence":null}],"metrics":[{"system":"CVSS_V3","vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:N","score":null,"severity":null},{"system":"Publisher rating","vector":null,"score":null,"severity":"LOW"}],"references":["https://github.com/fastify/fast-uri/security/advisories/GHSA-xhq7-xmqj-769h","https://nvd.nist.gov/vuln/detail/CVE-2026-110095","https://github.com/fastify/fast-uri/commit/048bbd0a252971be86d6579f0dfc87f8de5b9c47","https://github.com/fastify/fast-uri/commit/52774a5c35df36b0bbe439cd4c12c3dc0e50e3b9","https://github.com/fastify/fast-uri/commit/7c19f8b97ec51f1f20b4e3d9d5820cb8d5176058","https://github.com/fastify/fast-uri/commit/9eb8759a9825c046f57f7f695f1944bc39b88abd","https://github.com/fastify/fast-uri/commit/acc5c5d60c4209571789496e1732468911c7e12a","https://github.com/fastify/fast-uri/commit/b110a3571c37dfcf9d1c72ce2e2e178c78d1a424","https://cna.openjsf.org/security-advisories.html","https://github.com/fastify/fast-uri","https://github.com/fastify/fast-uri/releases/tag/v2.4.8","https://github.com/fastify/fast-uri/releases/tag/v3.1.9","https://github.com/fastify/fast-uri/releases/tag/v4.2.3"],"sourceUrl":"https://github.com/advisories/GHSA-xhq7-xmqj-769h","license":"GitHub Advisory Database · CC-BY-4.0","key":"osv:GHSA-xhq7-xmqj-769h","identifiers":["GHSA-xhq7-xmqj-769h","CVE-2026-110095"]},"retained":false,"historicalAffected":[]}],"coverage":[]}