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.
Published: 2026-10-22
Score: 6.9 Medium
EPSS: < 1% Very Low
KEV: No
Impact: n/a
Action: n/a
AI Analysis

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Remediation

No vendor fix or workaround currently provided.

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Tracking

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Advisories

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History

Wed, 04 Nov 2026 16:30:00 +0000

Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}


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:

Updated: 2026-11-04T15:58:53.364Z

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

Link: CVE-2026-114656

cve-icon Vulnrichment

Updated: 2026-11-04T15:58:46.767Z

cve-icon NVD

Status : Analyzed

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

Modified: 2026-11-04T16:17:41.910

Link: CVE-2026-114656

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

Updated: 2026-10-22T08:30:03Z

Weaknesses