CVE-2026-35042

HIGH

7.5

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.

Details CVE

Score CVSS v3.17.5

SeveriteHIGH

Vecteur CVSSCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N

Vecteur d'attaqueNETWORK

ComplexiteLOW

Privileges requisNONE

Interaction utilisateurNONE

Publie4/6/2026

Derniere modification4/6/2026

Sourcenvd

Observations honeypot0

Faiblesses (CWE)

CWE-345CWE-636

References

https://github.com/nearform/fast-jwt/security/advisories/GHSA-hm7r-c7qw-ghp6(security-advisories@github.com)

https://www.rfc-editor.org/rfc/rfc7515.html#section-4.1.11(security-advisories@github.com)

Correlations IOC

Aucune correlation enregistree

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