CVE-2026-114640

High

Description

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.

SeverityHigh

CVSS8.7

Exploit probability—

Product

Traefik

PublishedOct 22, 2026

First seenOct 22, 2026

Weakness typeCWE-290CWE-290

How to fix

Update

traefik traefik3.7.14 or later

Vendor advisories

github.com/traefik/traefik/security/advisories/GHSA-mwrr-6hp4-pxr6

Affected products

Product	Affected versions	Fixed in
traefik traefik	3.7.0 ≤ v < 3.7.14	3.7.14

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