CVE-2026-114640

Traefik v3.7.0 before v3.7.14 mTLS Header Spoofing via Ingress-NGINX HTTP Router

State: Published
Severity: 7.0 High
Published: Oct 22, 2026
Updated: Oct 28, 2026
Reserved: Oct 21, 2026

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.

Scores

CVSS	Score	Vector	Source
4.0	7.0 High	CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:N/SC:H/SI:H/SA:N	VulnCheck
3.1	8.7 High	CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:N	VulnCheck

Weaknesses

CWE-290 Authentication Bypass by Spoofing

Affected Products

Product	Versions
traefiktraefik	3.7.0 to before 3.7.14Affected 3.7.14Not affected

References

GitHub Security Advisory (GHSA-mwrr-6hp4-pxr6)vendor-advisory
VulnCheck Advisory: Traefik v3.7.0 before v3.7.14 mTLS Header Spoofing via Ingress-NGINX HTTP Routerthird-party-advisory

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