CVE-2026-34950

Published April 6th, 2026

View on NVD ↗

CVSS v3

9.1

CRITICAL

CVSS v2

N/A

Affected

PROJECT

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.

nearform/fast-jwt

Fast JSON Web Token implementation

GitHub

434