{"id":"CVE-2026-34950","revision":"9cd0ccdc794944d49258c05dcc977694","records":[{"revision":"9cd0ccdc794944d49258c05dcc977694","observedAt":"2026-10-27T09:03:08.102+00:00","statement":{"source":"nvd","id":"CVE-2026-34950","aliases":[],"title":"fast-jwt provides fast JSON Web Token (JWT) implementation. In 6.1.0 and earlier, the publicKeyPemMatcher regex in fast-jwt/src/crypto.js uses a ^ anchor that is defeated by any leading whitespace in the key string, re-enabling the exact sa…","description":"fast-jwt provides fast JSON Web Token (JWT) implementation. In 6.1.0 and earlier, the publicKeyPemMatcher regex in fast-jwt/src/crypto.js uses a ^ anchor that is defeated by any leading whitespace in the key string, re-enabling the exact same JWT algorithm confusion attack that CVE-2023-48223 patched.","state":0,"publishedAt":"2026-04-06T16:16:38.017+00:00","modifiedAt":"2026-10-26T21:10:00.17+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:H/I:H/A:N","score":9.1,"severity":"CRITICAL"}],"references":["https://github.com/nearform/fast-jwt/security/advisories/GHSA-mvf2-f6gm-w987"],"sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-34950","license":"NIST NVD usage terms; underlying source attribution retained","enrichment":{"sourceStatus":"Analyzed","weaknesses":["CWE-327"],"productCriteria":["cpe:2.3:a:nearform:fast-jwt:*:*:*:*:*:node.js:*:*"],"sourceDates":{"published":"2026-04-06T16:16:38.017","lastModified":"2026-10-26T21:10:00.170"},"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-2026-34950","identifiers":["CVE-2026-34950"]},"retained":false,"historicalAffected":[]}],"coverage":[]}