CVE-2026-34950 - 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 a JWT algorithm confusion vulnerability caused by improper regex anchoring in publicKeyPemMatcher, letting attackers bypass algorithm restrictions, exploit requires crafted JWT with leading whitespace.
Severity & Score
Severity: Critical
CVSS Score: 9.1
Impact
Attackers can bypass JWT algorithm restrictions, potentially allowing unauthorized access or privilege escalation.
Mitigation
Update to a version later than 6.1.0 or the latest available version.
Related Resources
Details
- CVE ID
- CVE-2026-34950
- Severity
- Critical
- CVSS Score
- 9.1
- Type
- broken_authentication
- Status
- new
CWE
- CWE-327
CVSS Metrics
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N