CVE-2026-35051
Published:April 30, 2026
Updated:May 18, 2026
Traefik is an HTTP reverse proxy and load balancer. Prior to versions 2.11.43, 3.6.14, and 3.7.0-rc.2, there is an authentication bypass vulnerability in Traefik's ForwardAuth middleware when trustForwardHeader=false is configured and Traefik is deployed behind a trusted upstream proxy. This issue has been patched in versions 2.11.43, 3.6.14, and 3.7.0-rc.2.
Affected Packages
github.com/traefik/traefik/v2 (GO):
Affected version(s) >=v2.0.0-rc1 <v2.11.43Fix Suggestion:
Update to version v2.11.43github.com/traefik/traefik/v2 (GO):
Affected version(s) >=v2.0.0-rc1 <v2.11.43Fix Suggestion:
Update to version v2.11.43Related Resources (6)
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Contact UsCVSS v4
Base Score:
7.8
Attack Vector
NETWORK
Attack Complexity
LOW
Attack Requirements
NONE
Privileges Required
NONE
User Interaction
NONE
Vulnerable System Confidentiality
NONE
Vulnerable System Integrity
NONE
Vulnerable System Availability
NONE
Subsequent System Confidentiality
HIGH
Subsequent System Integrity
LOW
Subsequent System Availability
NONE
CVSS v3
Base Score:
9.3
Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
CHANGED
Confidentiality
HIGH
Integrity
LOW
Availability
NONE
Weakness Type (CWE)
Insufficient Verification of Data Authenticity
EPSS
Base Score:
0.02