Security Advisory

CVE-2026-35042

CVE vulnerability detail - eXtreme Datacenter Security Operations

Published 2026-04-06 17:02:12

Last updated 2026-04-07 15:59:49

Assigner GitHub_M

CVSS score 7.5

State PUBLISHED

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.

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