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.
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| traefik | traefik | 3.7.0 – < 3.7.14 | 3.7.14 |
Fixed in Linux distributions
Distributions backport fixes, so the version that fixes this vulnerability differs per release — upgrade to at least the version shown. From the distributions' security trackers and advisories.
openSUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| openSUSE Tumbleweed | traefik | 3.7.16-1.1 | openSUSE-SU-2026:12281-1 |
Advisories 1
- openSUSE-SU-2026:12281-1 traefik-3.7.16-1.1 on GA media SUSE / openSUSE Security Updates · Oct 27, 2026
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 Router third-party-advisory