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CVE-2026-34950

9.1 critical SSVC exploitation: poc Analyzed
NVD · CVE.org

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.

Fix

Patch, vendor advisory and mitigation references on NVD 1

Every line above is quoted from NVD, CISA, Microsoft, the vendor's own advisory or DISA; nothing is generated.

Change history 1

  1. First seenCVSS 9.1 · nearformNVD modified 2026-10-26 21:10

Affected (CPE criteria) 1

  • cpe:2.3:a:nearform:fast-jwt:*:*:*:*:*:node.js:*:*

References 1