fast-jwt has a ReDoS when using RegExp in allowed* leading to CPU exhaustion during token verification

⚠️ IMPORTANT CLARIFICATIONS Affected Configurations This vulnerability ONLY affects applications that: - Use RegExp objects not strings in the allowedAud, allowedIss, allowedSub, allowedJti, or allowedNonce options - Configure patterns susceptible to catastrophic backtracking - Example: allowedAud...

CVE-2026-35041: Inefficient Regular Expression Complexity

fast-jwt provides fast JSON Web Token JWT implementation. From 5.0.0 to 6.2.0, a denial-of-service condition exists in fast-jwt when the allowedAud verification option is configured using a regular expression. Because the aud claim is attacker-controlled and the library evaluates it against the...