CRITICAL SeverityCVSS 3.19.1CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N

CVE-2026-34950

Last updated Apr 06, 2026 · Published Apr 06, 2026

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.

Affected products

1 listed

nearform:fast-jwt

Mappings

CWE

CWE-327

CAPEC

None listed.