CVE-2026-35039CRITICAL 9.1EPSS p11.4%

CVE-2026-35039CVE-2026-35039

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.

Scoring

CVSS 3.19.1 (CRITICAL)
VectorCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N
EPSS0.21% probability of exploitation · percentile 11.4% · 2026-06-18T12:00:27Z
Published2026-04-06
Last modified2026-04-22

Underlying weaknesses· 3

CWE-345CWE-706CWE-1289

References

  1. https://github.com/nearform/fast-jwt/commit/de121056c6415b58770c60640881eaec67ac4ceb
  2. https://github.com/nearform/fast-jwt/security/advisories/GHSA-rp9m-7r4c-75qg

3

TypeTargetConfidenceTier
WeaknessImproper Validation of Unsafe Equivalence in Inputcwe-12890%live
WeaknessInsufficient Verification of Data Authenticitycwe-3450%live
WeaknessUse of Incorrectly-Resolved Name or Referencecwe-7060%live

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Sourced from NVD + FIRST.org EPSS. Curated for EU compliance use cases by Adam Lundqvist, Founder at SQUR.