High 7.5Published Oct 21, 2026

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

Updated under an hour ago (Oct 27, 2026, 6:40 AM ET)

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It affects traefik. Add what you run to find out whether that includes you.

EPSS puts the chance of exploitation in the next 30 days at 0.16%, higher than 5% of scored CVEs.

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Exploited in the last 30 days

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: 7.5 HIGH (v3.1, CNA)CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:L/A:N
Weakness (CWE): CWE-436
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): 0.16% (percentile 5)
Assigned by: VulnCheck
NVD analysis: Undergoing Analysis
Record last updated: Oct 21, 2026
First seen by InfoSec Signals: Oct 21, 2026

Affected products

Affected products

traefik traefik traefik:traefik (from the name)	before 2.11.58; 2.11.58 not affected	CNA record

References

References

https://github.com/traefik/traefik/security/advisories/GHSA-2272-4vv8-65ww	vendor-advisory
https://www.vulncheck.com/advisories/traefik-before-2.11.58-and-3.7.13-mtls-bypass-via-negated-host-matcher	third-party-advisory

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.