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CVE-2026-114656— Traefik before 2.11.58 and 3.7.13 mTLS Bypass via Negated Host Matcher

Quick assessment

Affected
traefik traefik
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Traefik 2.11.58 之前版本以及 3.7.13 之前版本存在一个身份验证绕过漏洞。该漏洞允许未经身份验证的客户端跳过客户端证书检查，原因是被否定的 Host 匹配器（negated Host matchers）被计为已服务的域名。当带有 的路由器规则引发 TLS 选项冲突并回退到默认选项时，攻击者即可访问受 保护的后端服务。

CVSS 7.5 · High
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I. Basic Information for CVE-2026-114656

Vulnerability Information
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Vulnerability Title
Traefik before 2.11.58 and 3.7.13 mTLS Bypass via Negated Host Matcher
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:L/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
解释冲突
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
traefik traefik 0 ~ 2.11.58 -
traefik traefik 3.0.0 ~ 3.7.13 -

II. Public POCs for CVE-2026-114656

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III. Intelligence Information for CVE-2026-114656

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Other References for CVE-2026-114656 (2)

Same Patch Batch · traefik · 2026-10-22 · 9 CVEs total

CVE-2026-114638 8.7 HIGH Traefik v3.7.0 before v3.7.14 Client CA Mix-up via auth-tls-secret Name Collision
CVE-2026-114640 8.7 HIGH Traefik v3.7.0 before v3.7.14 mTLS Header Spoofing via Ingress-NGINX HTTP Router
CVE-2026-114639 8.7 HIGH Traefik before 2.11.58 and 3.7.14 Authentication Bypass via Negotiate Connection Pool
CVE-2026-114635 8.7 HIGH Traefik before v2.11.58 and v3.7.14 SNI Check Bypass via HTTP/2 Scheme
CVE-2026-114642 8.7 HIGH Traefik before 2.11.58 and 3.7.14 TLS Config Bypass via NTLM/Kerberos Round Tripper
CVE-2026-114637 8.7 HIGH Traefik v3.2.0 before v3.7.14 FastProxy NTLM/Negotiate Connection Pool Identity Leak
CVE-2026-114636 8.7 HIGH Traefik v3.7.13 Authentication Bypass via ssl-passthrough Ingress HTTP Router
CVE-2026-114641 3.7 LOW Traefik before 2.11.58 and 3.7.14 Race Condition in NTLM/Kerberos Round Tripper

IV. Related Vulnerabilities

Same product: traefik
Same vendor: traefik
Same weakness: CWE-436

V. Comments for CVE-2026-114656

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