CVE-2026-35039

CRITICAL SEVERITY

CVSS Score & Metrics

Base Score

9.1 / 10

Vector String

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

Vulnerability 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.

Vulnerability Details

Published Date

April 03, 2026

Last Modified

April 08, 2026

CWE ID

CWE-345

Source

GitHub

Vendor

npm

Product

fast-jwt

External References

https://github.com/nearform/fast-jwt/security/advisories/GHSA-rp9m-7r4c-75qg
https://github.com/advisories/GHSA-rp9m-7r4c-75qg

CVE-2026-35039

CVSS Score & Metrics

Vulnerability Description

Vulnerability Details

External References

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