CVE-2026-114642
Published:October 22, 2026
Updated:October 22, 2026
Traefik 2.11.0 before 2.11.58 and 3.0.0 before 3.7.14 stores its NTLM/Kerberos backend round tripper in a client-connection slot not keyed by ServersTransport, so one service's TLS client configuration is reused for another service's backend. An unauthenticated client can arm the slot via a backend issuing an NTLM or Negotiate challenge, then reach another service on the same keep-alive connection, bypassing its root CAs, server name, and certificate verification.
Affected Packages
https://github.com/traefik/traefik.git (GITHUB):
Affected version(s) >=v3.0.0-rc1 <v3.7.14Fix Suggestion:
Update to version v3.7.14https://github.com/traefik/traefik.git (GITHUB):
Affected version(s) >=v2.11.0 <v2.11.58Fix Suggestion:
Update to version v2.11.58github.com/traefik/traefik/v2 (GO):
Affected version(s) >=v2.11.0 <v2.11.58Fix Suggestion:
Update to version v2.11.58github.com/traefik/traefik/v3 (GO):
Affected version(s) >=v3.0.0-rc1 <v3.7.14Fix Suggestion:
Update to version v3.7.14Related Resources (3)
Do you need more information?
Contact UsCVSS v4
Base Score:
7
Attack Vector
NETWORK
Attack Complexity
LOW
Attack Requirements
PRESENT
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
HIGH
Subsequent System Availability
NONE
CVSS v3
Base Score:
8.7
Attack Vector
NETWORK
Attack Complexity
HIGH
Privileges Required
NONE
User Interaction
NONE
Scope
CHANGED
Confidentiality
HIGH
Integrity
HIGH
Availability
NONE
Weakness Type (CWE)
Improper Certificate Validation
EPSS
Base Score:
0.17