Authentication Bypass Vulnerability in Traefik by Containous
CVE-2026-114637

7HIGH

Key Information:

Vendor

Traefik

Status
Traefik
Vendor
CVE Published:
22 October 2026

What is CVE-2026-114637?

Traefik versions from v3.2.0 to v3.7.13 exhibit an authentication bypass issue in the experimental FastProxy connection pool. This vulnerability potentially allows unauthenticated clients to exploit pooled keep-alive backend connections that have been securely established through NTLM or Negotiate authentication. As a result, attackers can gain unauthorized access to sensitive data transmitted by victims, making this a significant security concern.

Affected Version(s)

traefik 3.2.0 < 3.7.14

traefik 3.7.14

References

https://github.com/traefik/traefik/security/advisories/GH...
vendor-advisory
https://www.vulncheck.com/advisories/traefik-3.2.0-before...
third-party-advisory

CVSS V4

Score:
7
Severity:
HIGH
Confidentiality:
None
Integrity:
None
Availability:
None
Attack Vector:
Network
Attack Complexity:
Low
Attack Required:
Physical
Privileges Required:
Undefined
User Interaction:
None

Timeline

  • Vulnerability published

  • Vulnerability Reserved

Credit

AndyAnh174
.