CVE-2026-114640

Traefik from v3.7.0 before v3.7.14 contains an authentication bypass vulnerability in its Kubernetes Ingress-NGINX provider that forwards client-supplied Ssl-Client-* headers on the plaintext HTTP router. When ssl-redirect is disabled alongside auth-tls-pass-certificate-to-upstream, unauthenticated attackers can send Ssl-Client-Verify: SUCCESS with a chosen certificate subject and issuer to impersonate mTLS identities.

CVSS v3 8.7 HIGH

8.7^/10

CVSS v3 : HIGH

Vector :

Exploitability : 2.2 / Impact : 5.8

Attack Vector NETWORK

Attack Complexity HIGH

Privileges Required NONE

User Interaction NONE

Confidentiality Impact HIGH

Integrity Impact HIGH

Availability Impact NONE

Scope CHANGED

References

Link	Resource
https://github.com/traefik/traefik/security/advisories/GHSA-mwrr-6hp4-pxr6	Vendor Advisory
https://www.vulncheck.com/advisories/traefik-3.7.0-before-3.7.14-mtls-header-spoofing-via-ingress-nginx-http-router	Third Party Advisory

Configurations

Configuration 1 (hide)

cpe:2.3:a:traefik:traefik:*:*:*:*:*:*:*:*

History

27 Oct 2026, 14:16

Type	Values Removed	Values Added
CPE		cpe:2.3:a:traefik:traefik::::::::
References	~~() https://github.com/traefik/traefik/security/advisories/GHSA-mwrr-6hp4-pxr6 -~~	() https://github.com/traefik/traefik/security/advisories/GHSA-mwrr-6hp4-pxr6 - Vendor Advisory
References	~~() https://www.vulncheck.com/advisories/traefik-3.7.0-before-3.7.14-mtls-header-spoofing-via-ingress-nginx-http-router -~~	() https://www.vulncheck.com/advisories/traefik-3.7.0-before-3.7.14-mtls-header-spoofing-via-ingress-nginx-http-router - Third Party Advisory
First Time		Traefik Traefik traefik

22 Oct 2026, 02:16

Type	Values Removed	Values Added
New CVE

Information

Published : 2026-10-22 02:16

Updated : 2026-10-28 03:17

NVD link : CVE-2026-114640

Mitre link : CVE-2026-114640

CVE.ORG link : CVE-2026-114640

JSON object : View

Products Affected

traefik

traefik

CWE

CWE-290

Authentication Bypass by Spoofing

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