CVE-2026-107723

CVE-2026-107723 · fast-jwt : Silent claim-validator bypass when JWT payload is a JSON array

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 6.3.0, fast-jwt createVerifier accepts a validly signed JWT whose payload is a JSON array because src/decoder.js checks that the payload is an object but does not reject arrays. The claim validator loop then finds no named exp, nbf, iss, aud, sub, jti, or nonce properties and silently skips those configured checks, returning the array as a successfully verified payload. An attacker who can produce or influence a validly signed token may bypass expiry, issuer, audience, subject, revocation, and replay protections. The opt-in requiredClaims option can block missing claims, and signature verification itself is not bypassed. This issue is fixed in version 6.3.0.

CVSS 8.1 · Alta · EPSS 0,5% · Corrección disponible

Publicación

2026-10-08T21:51:22.183Z

Actualización

2026-10-14T01:25:44.088Z

Pila tecnológica: node

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