CVE-2026-114656 Traefik before 2.11.58 and 3.7.13 mTLS Bypass via Negated Host Matcher
Medium 6.9
Published
Updated
Check this codebase for CVE-2026-114656 and fix it if it is affected.
What it is: CVE-2026-114656 is a medium-severity vulnerability in traefik, published on 22 Oct 2026.
Exploitation: There is no known exploitation of CVE-2026-114656 in the wild and no public exploit code.
Affected product: traefik. No package-level version data is available, so check the vendor advisory linked from the reference page.
Task:
1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.
2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.
3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.
4. Run the tests and summarise what changed and why.
5. If nothing in the project is affected, say so and change nothing.
Reference: https://insights.sbomify.com/CVE-2026-114656/ (Markdown: https://insights.sbomify.com/CVE-2026-114656/index.md)
- Exploited in the wild
- Not known
- Fix
- Available
What is CVE-2026-114656?
CVE-2026-114656 is a medium-severity vulnerability in traefik, published on 22 Oct 2026.
Official 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.
Weakness: CWE-436
Which versions are affected by CVE-2026-114656?
How do I fix CVE-2026-114656?
Upgrade to a fixed version.
Is CVE-2026-114656 being exploited?
There is no known exploitation of CVE-2026-114656 in the wild and no public exploit code.
Sources
Also known as GHSA-2272-4vv8-65ww, GHSA-rq4g-2h45-7vgr.