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CVE-2026-35040

CVE-2026-35040 · fast-jwt: Stateful RegExp (/g or /y) causes non-deterministic allowed-claim validation (logical DoS)

Esta página presenta datos de fuentes públicas de vulnerabilidades. Consulta el aviso original antes de actualizar.

fast-jwt provides fast JSON Web Token (JWT) implementation. Prior to 6.2.1, using certain modifiers on RegExp objects in the allowedAud, allowedIss, allowedSub, allowedJti, or allowedNonce options in verify functions can cause certain unintended behaviours. This is because some modifiers are stateful and will cause failures in every second verification attempt regardless of the validity of the token provided. Such modifiers are /g (global matching) and /y (sticky matching). This does NOT allow invalid tokens to be accepted, only for valid tokens to be improperly rejected in some configurations. Instead it causes 50% of valid authentication requests to fail in an alternating pattern. This vulnerability is fixed in 6.2.1.

CVSS 5.3 · Media · EPSS 0,4% · Corrección disponible

Publicación
Actualización

Pila tecnológica: node

Productos y versiones afectados

  • fast-jwt

    Versiones
    • < 6.2.1: Afectada

    Sin corrección publicada

  • fast-jwt npm

    Intervalos de versiones afectados
    • SEMVER: < 6.2.1

    Actualiza a 6.2.1

Fuentes originales

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