CVE-2026-34950 - Vulnerability Analysis
CriticalCVSS: 9.1Last Updated: April 7, 2026
fast-jwt - Authentication Bypass
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
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.
Social Media Activity(2 posts)
š“ CVE-2026-34950 - Critical (9.1) fast-jwt provides fast JSON Web Token (JWT) implementation. In 6.1.0 and earlier, the publicKeyPemMatcher regex in fast-jwt/src/crypto.js uses a ^ anchor that is defeated by any leading whitespace in the key string, re-enabling the exact same JWT ... š https://www.thehackerwire.com/vulnerability/CVE-2026-34950/ #CVE #vulnerability #infosec #cybersecurity #security #Tenda #patchstack
View original postš“ CVE-2026-34950 - Critical (9.1) fast-jwt provides fast JSON Web Token (JWT) implementation. In 6.1.0 and earlier, the publicKeyPemMatcher regex in fast-jwt/src/crypto.js uses a ^ anchor that is defeated by any leading whitespace in the key string, re-enabling the exact same JWT ... š https://www.thehackerwire.com/vulnerability/CVE-2026-34950/ #CVE #vulnerability #infosec #cybersecurity #security #Tenda #patchstack
View original postRelated Resources
Details
- CVE ID
- CVE-2026-34950
- Severity
- Critical
- CVSS Score
- 9.1
- Type
- broken_authentication
- Status
- unconfirmed
- EPSS
- 2.1%
- Social Posts
- 2
CWE
- CWE-327
CVSS Metrics
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N