CVE-2026-35039 - Vulnerability Analysis
CriticalCVSS: 9.1Last Updated: April 6, 2026
fast-jwt - Authentication Bypass
Published: April 6, 2026Updated: April 6, 2026Remote Exploitable
Overview
fast-jwt < 6.1.0 contains an authentication bypass caused by improper cacheKeyBuilder method leading to cache collisions, letting attackers cause token misidentification and user impersonation, exploit requires custom cacheKeyBuilder usage.
Severity & Score
Severity: Critical
CVSS Score: 9.1
Impact
Attackers can cause token misidentification, leading to user impersonation and unauthorized access to other users' claims.
Mitigation
Update to version 6.1.0 or later.
Related Resources
Details
- CVE ID
- CVE-2026-35039
- Severity
- Critical
- CVSS Score
- 9.1
- Type
- broken_authentication
- Status
- new
CWE
- CWE-345
CVSS Metrics
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N