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CVE-2026-35041

MEDIUM

4.2

Description

fast-jwt provides fast JSON Web Token (JWT) implementation. From 5.0.0 to 6.2.0, a denial-of-service condition exists in fast-jwt when the allowedAud verification option is configured using a regular expression. Because the aud claim is attacker-controlled and the library evaluates it against the supplied RegExp, a crafted JWT can trigger catastrophic backtracking in the JavaScript regex engine, resulting in significant CPU consumption during verification. This vulnerability is fixed in 6.2.1.

Details CVE

Score CVSS v3.14.2

SeveriteMEDIUM

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

Vecteur d'attaqueNETWORK

ComplexiteHIGH

Privileges requisHIGH

Interaction utilisateurREQUIRED

Publie4/9/2026

Derniere modification4/14/2026

Sourcenvd

Observations honeypot0

Produits affectes

nearform:fast-jwt

Faiblesses (CWE)

CWE-1333

References

https://github.com/nearform/fast-jwt/commit/b0be0ca161593836a153d5180ca5358ad9b5de94(security-advisories@github.com)

https://github.com/nearform/fast-jwt/pull/595(security-advisories@github.com)

https://github.com/nearform/fast-jwt/releases/tag/v6.2.1(security-advisories@github.com)

https://github.com/nearform/fast-jwt/security/advisories/GHSA-cjw9-ghj4-fwxf(security-advisories@github.com)

https://github.com/nearform/fast-jwt/security/advisories/GHSA-cjw9-ghj4-fwxf(134c704f-9b21-4f2e-91b3-4a467353bcc0)

Correlations IOC

Aucune correlation enregistree

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