CVE-2026-114640

HIGH 8.7

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

CVSS Score

8.7

EPSS Score

0.0%

EPSS Percentile

0th

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.

CWE	CWE-290
Vendor	traefik
Product	traefik
Published	Oct 22, 2026

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CVSS v3 Breakdown

CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:N

Attack Vector

Network

Attack Complexity

High

Privileges Required

None

User Interaction

None

Scope

Changed

Confidentiality

High

Integrity

High

Availability

None

Affected Versions

traefik / traefik

3.7.0 < 3.7.14

References

NVD ↗ CVE.org ↗ EPSS Data ↗

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

Credits

Kushalkhemka mayank-jangid-moon skigeek16 opensec-intelligence