CVE-2026-114656

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.

CVSS v3 7.5 HIGH

7.5^/10

CVSS v3 : HIGH

Vector :

Exploitability : 2.2 / Impact : 4.7

Attack Vector NETWORK

Attack Complexity HIGH

Privileges Required NONE

User Interaction NONE

Confidentiality Impact HIGH

Integrity Impact LOW

Availability Impact NONE

Scope CHANGED

References

Link	Resource
https://github.com/traefik/traefik/security/advisories/GHSA-2272-4vv8-65ww	Vendor Advisory Patch
https://www.vulncheck.com/advisories/traefik-before-2.11.58-and-3.7.13-mtls-bypass-via-negated-host-matcher	Third Party Advisory

Configurations

Configuration 1 (hide)

OR	cpe:2.3:a:traefik:traefik::::::::
	cpe:2.3:a:traefik:traefik::::::::

History

30 Oct 2026, 15:19

Type	Values Removed	Values Added
First Time		Traefik Traefik traefik
CPE		cpe:2.3:a:traefik:traefik::::::::
References	~~() https://github.com/traefik/traefik/security/advisories/GHSA-2272-4vv8-65ww -~~	() https://github.com/traefik/traefik/security/advisories/GHSA-2272-4vv8-65ww - Vendor Advisory, Patch
References	~~() https://www.vulncheck.com/advisories/traefik-before-2.11.58-and-3.7.13-mtls-bypass-via-negated-host-matcher -~~	() https://www.vulncheck.com/advisories/traefik-before-2.11.58-and-3.7.13-mtls-bypass-via-negated-host-matcher - Third Party Advisory

22 Oct 2026, 02:16

Type	Values Removed	Values Added
New CVE

Information

Published : 2026-10-22 02:16

Updated : 2026-10-30 15:19

NVD link : CVE-2026-114656

Mitre link : CVE-2026-114656

CVE.ORG link : CVE-2026-114656

JSON object : View

Products Affected

traefik

traefik

CWE

CWE-436

Interpretation Conflict

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