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.
History

Thu, 22 Oct 2026 02:00:00 +0000

Type Values Removed Values Added
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.
Title Traefik before 2.11.58 and 3.7.13 mTLS Bypass via Negated Host Matcher
First Time appeared Traefik
Traefik traefik
Weaknesses CWE-436
CPEs cpe:2.3:a:traefik:traefik:*:*:*:*:*:*:*:*
Vendors & Products Traefik
Traefik traefik
References
Metrics cvssV3_1

{'score': 7.5, 'vector': 'CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:L/A:N'}

cvssV4_0

{'score': 6.9, 'vector': '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'}


cve-icon MITRE

Status: PUBLISHED

Assigner: VulnCheck

Published: 2026-10-22T01:43:42.056Z

Updated: 2026-10-22T01:43:42.056Z

Reserved: 2026-10-21T21:59:05.256Z

Link: CVE-2026-114656

cve-icon Vulnrichment

No data.

cve-icon NVD

Status : Analyzed

Published: 2026-10-22T02:16:57.403

Modified: 2026-10-30T15:19:02.253

Link: CVE-2026-114656

cve-icon Redhat

No data.