CVE-2026-114656CWE-436

CVE-2026-114656

High · published October 22, 2026

CVSS v3.1
7.5
EPSS
0%
Percentile
5.2
In the wild
Unconfirmed
What it is

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.

The record
Technical detail
CVSS v3.1
7.5 · HIGH
Vector
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:L/A:N
CVSS v4.0
6.9 · 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
EPSS
0.00163 · 5.2th percentile
Weakness
CWE-436 · Interpretation Conflict
Published
2026-10-22T06:16Z
References (2)
https://github.com/traefik/traefik/security/advisories/GHSA-2272-4vv8-65ww · [email protected]https://www.vulncheck.com/advisories/traefik-before-2.11.58-and-3.7.13-mtls-bypass-via-negated-host-matcher · [email protected]
EPSS history
Timeline
  • 23 OCT 03:55Z
    EPSS moved — → 0%
    epss
  • 22 OCT 01:43Z
    Traefik before 2.11.58 and 3.7.13 mTLS Bypass via Negated Host Matcher
    cvelistv5
  • 22 OCT 01:43Z
    Traefik before 2.11.58 and 3.7.13 mTLS Bypass via Negated Host Matcher
    cvelistv5