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Vulnerability DatabaseCVE-2026-35042

CVE-2026-35042: 
JavaScript vulnerability analysis and mitigation

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.

Source: NVD

Related JavaScript vulnerabilities:

CVE ID

Severity

Score

Technologies

Component name

CISA KEV exploit

Has fix

Published date

GHSA-p6x5-p4xf-cc4rCRITICAL9.8
  • JavaScriptJavaScript
  • math-codegen
NoYesApr 17, 2026
CVE-2026-41242CRITICAL9.4
  • JavaScriptJavaScript
  • librechat
NoYesApr 18, 2026
GHSA-v38x-c887-992fCRITICAL9.2
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CVE-2026-41265CRITICAL9.2
  • JavaScriptJavaScript
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NoYesApr 18, 2026
CVE-2026-40346MEDIUM6.4
  • JavaScriptJavaScript
  • @nocobase/plugin-workflow-request
NoYesApr 18, 2026

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