CVE-2026-35039

CriticalCVSS 9.1/10Last modified Oct 23, 2026

Description

fast-jwt provides fast JSON Web Token (JWT) implementation. From 0.0.1 to before 6.2.0, setting up a custom cacheKeyBuilder method which does not properly create unique keys for different tokens can lead to cache collisions. This could cause tokens to be mis-identified during the verification process leading to valid tokens returning claims from different valid tokens and users being mis-identified as other users based on the wrong token. Version 6.2.0 contains a patch.

Metrics

CVSS 3.1 9.1/10CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N

Weakness enumeration

CWE-345 CWE-706 CWE-1289

Affected software

Vendor	Product	Versions
nearform	fast-jwt	>= 0.0.1, < 6.2.0

References

https://github.com/nearform/fast-jwt/commit/de121056c6415b58770c60640881eaec67ac4cebPatch
https://github.com/nearform/fast-jwt/security/advisories/GHSA-rp9m-7r4c-75qgMitigation, Vendor Advisory

Timeline

Published: Apr 6, 2026
Last modified: Oct 23, 2026
NVD status: Analyzed

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