CVE-2026-114656
Traefik before 2.11.58 and 3.7.13 mTLS Bypass via Negated Host Matcher
- State
- Published
- Severity
- 6.9 Medium
- Published
- Oct 22, 2026
- Updated
- Oct 22, 2026
- Reserved
- Oct 21, 2026
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.
Scores
| CVSS | Score | Vector | Source |
|---|---|---|---|
| 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 | 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 | VulnCheck |
Weaknesses
- CWE-436 Interpretation Conflict
Affected Products
| Product | Versions |
|---|---|
traefiktraefik |
|
traefiktraefik |
|
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 Matcherthird-party-advisory
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