Description
Traefik before 2.11.58 and 3.7.13 contains an authentication bypass vulnerability that allows unauthenticated clients to skip client-certificate checks because negated Host matchers are counted as served domains. Attackers can reach backends protected by RequireAndVerifyClientCert when a router rule with !Host() creates a TLS options conflict that falls back to the default options.
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| traefik | traefik | < 2.11.58, 3.0.0 – < 3.7.13 | 2.11.58 |
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 |
Wolfi
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Wolfi rolling | traefik-3.6 | No fix yet | — |
Public exploits
Exploit or proof-of-concept code for this vulnerability is publicly available, which lowers the bar for attackers. Treat it as a reason to patch sooner.
GitHub 1 repository
-
fixedbyreboot/CVE-2026-114656-POC ★ 0 · Nov 10, 2026
POC for CVE-2026-114656 - Traefik mTLS client certificate bypass via negated Host matchers forcing default TLS options. Vulnerable vs fixed differential included.
Sources: PoC-in-GitHub, Metasploit Framework, Exploit-DB — updated daily. Only links are listed; no exploit code is hosted here.
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-2272-4vv8-65ww) vendor-advisory
- VulnCheck Advisory: Traefik before 2.11.58 and 3.7.13 mTLS Bypass via Negated Host Matcher third-party-advisory