{"id":"CVE-2026-35042","revision":"0d49d642c8b84a2d9a860130bba832e0","records":[{"revision":"0d49d642c8b84a2d9a860130bba832e0","observedAt":"2026-10-25T08:17:35.884+00:00","statement":{"source":"nvd","id":"CVE-2026-35042","aliases":[],"title":"fast-jwt provides fast JSON Web Token (JWT) implementation. In 6.1.0 and earlier, fast-jwt does not validate the crit (Critical) Header Parameter defined in RFC 7515 §4.1.11. When a JWS token contains a crit array listing extensions that fa…","description":"fast-jwt provides fast JSON Web Token (JWT) implementation. In 6.1.0 and earlier, fast-jwt does not validate the crit (Critical) Header Parameter defined in RFC 7515 §4.1.11. When a JWS token contains a crit array listing extensions that fast-jwt does not understand, the library accepts the token instead of rejecting it. This violates the MUST requirement in the RFC.","state":0,"publishedAt":"2026-04-06T17:17:13.41+00:00","modifiedAt":"2026-10-24T13:10:00.147+00:00","affected":[],"metrics":[{"system":"CVSS 3.1 · security-advisories@github.com · Secondary","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N","score":7.5,"severity":"HIGH"}],"references":["https://github.com/nearform/fast-jwt/security/advisories/GHSA-hm7r-c7qw-ghp6","https://www.rfc-editor.org/rfc/rfc7515.html#section-4.1.11"],"sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-35042","license":"NIST NVD usage terms; underlying source attribution retained","enrichment":{"sourceStatus":"Analyzed","weaknesses":["CWE-345","CWE-636"],"productCriteria":["cpe:2.3:a:nearform:fast-jwt:*:*:*:*:*:node.js:*:*"],"sourceDates":{"published":"2026-04-06T17:17:13.410","lastModified":"2026-10-24T13:10:00.147"},"relatedAdvisories":[],"note":"NVD analysis and CPE criteria are source context, not proof that a package or your environment is affected. Complete affected data, logical configurations and SSVC are retained in the original JSON."},"key":"nvd:CVE-2026-35042","identifiers":["CVE-2026-35042"]},"retained":false,"historicalAffected":[]}],"coverage":[]}