High severity · published Oct 22, 2026
CVE-2026-114656
Traefik before 2.11.58 and 3.7.13 mTLS Bypass via Negated Host Matcher
New
7.5
CVSS
0.2%
EPSS
No
On KEV
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.
CVSS vector
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:L/A:N
Attack vector
Network
Complexity
High
Privileges
None
User interaction
None
Confidentiality
High
Integrity
Low
Availability
None
Scope
Changed
Exploitation
Is it being used?
Exploit prediction (EPSS)0.2% · higher than 5% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
TR
traefik · traefik
before 2.11.58; 3.0.0 before 3.7.13 · source: vendor
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-114656
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-114656
github.com
https://github.com/traefik/traefik/security/advisories/GHSA-2272-4vv8-65ww
www.vulncheck.com
https://www.vulncheck.com/advisories/traefik-before-2.11.58-and-3.7.13-mtls-bypass-via-negated-host-matcher
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