CVE-2026-35042

HighCVSS 7.5/10Last modified Oct 24, 2026

Description

fast-jwt provides fast JSON Web Token (JWT) implementation. In 6.1.0 and earlier, fast-jwt does not validate the crit (Critical) Header Parameter defined in RFC 7515 §4.1.11. When a JWS token contains a crit array listing extensions that fast-jwt does not understand, the library accepts the token instead of rejecting it. This violates the MUST requirement in the RFC.

Metrics

CVSS 3.1 7.5/10CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N

Weakness enumeration

CWE-345 CWE-636

Affected software

No affected versions have been published.

Timeline

Published: Apr 6, 2026
Last modified: Oct 24, 2026
NVD status: Analyzed

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