CVE-2026-34950

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 patch...

CVE-2026-34950

creationtimestamp| type| source ---|---|--- 2026-04-02 08:53:21+00:00| published-proof-of-concept| https://github.com/nearform/fast-jwt/security/advisories/GHSA-mvf2-f6gm-w987 2026-04-06 16:20:11+00:00| seen| https://bsky.app/profile/thehackerwire.bsky.social/post/3mito77wzr22s 2026-04-06...