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CVE PROGRAM SOURCE RECORD7.5 High

CVE-2026-35042

fast-jwt accepts unknown `crit` header extensions (RFC 7515 §4.1.11 MUST violation)

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Status
Published
Published
Updated
Assigning organization
GitHub_M

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.

Affected products

Version statuses are supplied by the assigning organization. Consult the original record for detailed ranges and platform conditions.

nearform fast-jwt

  • <= 6.1.0affected

References