CVE-2026-35042

CVE-2026-35042CVE-2026-35042

nearform / fast-jwt

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.

Scoring

CVSS 7.5 ()
VectorCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N
Last modified2026-10-24
Sourced from NVD. Curated for EU compliance use cases by Adam Lundqvist, Founder at SQUR.