CVE-2026-35040
CVE-2026-35040 · fast-jwt: Stateful RegExp (/g or /y) causes non-deterministic allowed-claim validation (logical DoS)
Cette page présente des faits issus de sources publiques. Consultez l’avis original avant toute mise à jour.
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 · Moyenne · EPSS 0,4% · Correctif disponible
- Publication
- Mise à jour
Pile logicielle: node
Produits et versions concernés
Sources originales
- https://github.com/nearform/fast-jwt/security/advisories/GHSA-3j8v-cgw4-2g6q
- https://github.com/nearform/fast-jwt/pull/593
- https://github.com/nearform/fast-jwt/commit/18d25904e4617e8753526d1b3ab5a2cccdea726a
- https://github.com/nearform/fast-jwt/releases/tag/v6.2.1
- https://nvd.nist.gov/vuln/detail/CVE-2026-35040