CVE-2026-35039

CRITICAL EPSS 11.5%
Published Apr 6, 20262mo ago · Modified Jun 17, 20262w ago
9.1 CVSS 3.1
Critical
Find Similar
Published Apr 6, 2026 2mo ago
Last Modified Jun 17, 2026 2w ago

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.

CVSS Details

Base Score
9.1
Exploitability
3.9
Impact
5.2
Vector string
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N
Attack Vector Network
Attack Complexity Low
Privileges Required None
User Interaction None
Scope Unchanged
Confidentiality High
Integrity High
Availability None

Threat Intelligence

EPSS Exploit Probability
11.5% percentile
Exploit & Patch Status
No Known Exploit
Patch Available

Weaknesses 3

CWE-1289
CWE-345
CWE-706

Affected Products 1

VendorProductVersionRange
nearformfast-jwt*≥0.1.0  –  <6.1.0

References 2

  • github.com https://github.com/nearform/fast-jwt/commit/de121056c6415b58770c60640881eaec67ac4ceb
    Patch
  • github.com https://github.com/nearform/fast-jwt/security/advisories/GHSA-rp9m-7r4c-75qg
    MitigationVendor Advisory

Remediation

  • github.com https://github.com/nearform/fast-jwt/commit/de121056c6415b58770c60640881eaec67ac4ceb
    Patch