CVE-2026-114656
Traefik before 2.11.58 and 3.7.13 mTLS Bypass via Negated Host Matcher
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.
Fixes and workarounds
No remediation reported in collected sources.
Missing remediation information is not evidence that no patch exists.
Affected products and versions
| Product | Versions | Authority |
|---|---|---|
| traefik traefik github.com/traefik/traefik/v2
golang |
≥ 0; < 2.11.58 (affected, semver) 2.11.58 (unaffected, semver) Other versions: unaffected |
CNA: VulnCheck |
| traefik traefik github.com/traefik/traefik/v3
golang |
≥ 3.0.0; < 3.7.13 (affected, semver) 3.7.13 (unaffected, semver) Other versions: unaffected |
CNA: VulnCheck |
Version ranges are source assertions. Check the vendor advisory and your installed configuration before determining exposure.
CVSS assessments
| Version / score | Vector | Authority |
|---|---|---|
| 4.0 / 6.9 medium |
CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:N/SC:H/SI:L/SA:N | CNA: VulnCheck |
| 3.1 / 7.5 high |
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:L/A:N | CNA: VulnCheck |
Exploit evidence
No exploit evidence in collected sources. This is not proof of no exploitation.
References
- https://github.com/traefik/traefik/security/advisories/GHSA-2272-4vv8-65wwCNA: VulnCheck · vendor-advisory
- https://www.vulncheck.com/advisories/traefik-before-2.11.58-and-3.7.13-mtls-bypass-via-negated-host-matcherCNA: VulnCheck · third-party-advisory
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