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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.

PUBLISHED Reserved 2026-03-31 | Published 2026-04-06 | Updated 2026-05-13 | Assigner GitHub_M




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

Problem types

CWE-345: Insufficient Verification of Data Authenticity

CWE-706: Use of Incorrectly-Resolved Name or Reference

CWE-1289: Improper Validation of Unsafe Equivalence in Input

Product status

>= 0.0.1, < 6.2.0
affected

References

github.com/...st-jwt/security/advisories/GHSA-rp9m-7r4c-75qg

github.com/...ommit/de121056c6415b58770c60640881eaec67ac4ceb

cve.org (CVE-2026-35039)

nvd.nist.gov (CVE-2026-35039)

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