{"id":"EUVD-2026-95312","revision":"60a0c96bc18348f59e890dc91e71b3c3","records":[{"revision":"60a0c96bc18348f59e890dc91e71b3c3","observedAt":"2026-11-06T00:45:28.278+00:00","statement":{"source":"euvd","id":"EUVD-2026-95312","aliases":["CVE-2026-107724","GHSA-g3jj-5cmm-3hxx"],"title":"fast-jwt provides fast JSON Web Token (JWT) implementation. In 6.2.4, fast-jwt can classify raw serialized public JWK or JWKS JSON as an HMAC secret because src/crypto.js performDetectPublicKeyAlgorithms treats non-PEM strings as symmetric …","description":"fast-jwt provides fast JSON Web Token (JWT) implementation. In 6.2.4, fast-jwt can classify raw serialized public JWK or JWKS JSON as an HMAC secret because src/crypto.js performDetectPublicKeyAlgorithms treats non-PEM strings as symmetric key material. If HS256 is explicitly allowed or inferred, an attacker who knows the exact serialized public-key bytes can use those bytes as an HMAC key and create a token containing arbitrary claims that createVerifier accepts. Serialization ordering or whitespace differences can prevent exploitation, and applications using supported PEM keys with an asymmetric-only algorithm allowlist are not affected. 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:H/PR:N/UI:N/S:U/C:H/I:H/A:N","score":7.4,"severity":null}],"references":["https://github.com/nearform/fast-jwt/security/advisories/GHSA-g3jj-5cmm-3hxx","https://github.com/nearform/fast-jwt/pull/636","https://github.com/nearform/fast-jwt/commit/10f9591349199ed2ab9fa1748ce92cdca697f6cf","https://github.com/nearform/fast-jwt/releases/tag/v6.3.0"],"sourceUrl":"https://euvd.enisa.europa.eu/vulnerability/EUVD-2026-95312","license":"ENISA EUVD · source terms and attribution apply","enrichment":{"sourceStatus":null,"weaknesses":[],"productCriteria":[],"sourceDates":{"datePublished":"Oct 8, 2026, 9:53:01 PM","dateUpdated":"Oct 9, 2026, 3:51:27 PM"},"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-2026-95312","identifiers":["EUVD-2026-95312","CVE-2026-107724","GHSA-g3jj-5cmm-3hxx"]},"retained":false,"historicalAffected":[]}],"coverage":[]}