{"id":"EUVD-2026-95348","revision":"723da22503b4437ebf3741a2466acbdb","records":[{"revision":"723da22503b4437ebf3741a2466acbdb","observedAt":"2026-11-05T03:59:03.972+00:00","statement":{"source":"euvd","id":"EUVD-2026-95348","aliases":["CVE-2026-107723","GHSA-5hjw-83fp-phq9"],"title":"fast-jwt provides fast JSON Web Token (JWT) implementation. Prior to 6.3.0, fast-jwt createVerifier accepts a validly signed JWT whose payload is a JSON array because src/decoder.js checks that the payload is an object but does not reject a…","description":"fast-jwt provides fast JSON Web Token (JWT) implementation. Prior to 6.3.0, fast-jwt createVerifier accepts a validly signed JWT whose payload is a JSON array because src/decoder.js checks that the payload is an object but does not reject arrays. The claim validator loop then finds no named exp, nbf, iss, aud, sub, jti, or nonce properties and silently skips those configured checks, returning the array as a successfully verified payload. An attacker who can produce or influence a validly signed token may bypass expiry, issuer, audience, subject, revocation, and replay protections. The opt-in requiredClaims option can block missing claims, and signature verification itself is not bypassed. This issue is fixed in version 6.3.0.","state":0,"publishedAt":null,"modifiedAt":null,"affected":[],"metrics":[{"system":"EUVD CVSS 3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N","score":8.1,"severity":null}],"references":["https://github.com/nearform/fast-jwt/security/advisories/GHSA-5hjw-83fp-phq9","https://github.com/nearform/fast-jwt/pull/639","https://github.com/nearform/fast-jwt/commit/86e83efd8b5244f50859532d99244f0a9a9a4368","https://github.com/nearform/fast-jwt/releases/tag/v6.3.0"],"sourceUrl":"https://euvd.enisa.europa.eu/vulnerability/EUVD-2026-95348","license":"ENISA EUVD · source terms and attribution apply","enrichment":{"sourceStatus":null,"weaknesses":[],"productCriteria":[],"sourceDates":{"datePublished":"Oct 8, 2026, 9:51:22 PM","dateUpdated":"Oct 14, 2026, 1:25:44 AM"},"relatedAdvisories":[],"note":"EUVD source date text has no stated timezone and is retained without inventing a UTC instant. Related bulletin membership is not an alias, common cause or applicability claim. A missing vector with a zero score is treated as unrated. Complete vendor/product and underlying source evidence remains in the original JSON."},"key":"euvd:EUVD-2026-95348","identifiers":["EUVD-2026-95348","CVE-2026-107723","GHSA-5hjw-83fp-phq9"]},"retained":false,"historicalAffected":[]}],"coverage":[]}