ETK-2026-1909Zero's internal tracking ID, independent of the CVE number.

{
  "etk_id": "ETK-2026-1909",
  "cve_id": null,
  "display_id": "ETK-2026-1909",
  "ghsa_id": "GHSA-p8wx-ph99-xgcr",
  "euvd_id": null,
  "status": "published",
  "anchor_state": "awaiting_cve",
  "title": "Mutual TLS authentication bypass in Traefik Kubernetes Ingress",
  "summary": "Traefik's Kubernetes Ingress NGINX provider can fail to enforce client-certificate authentication for a shared host when its Ingress resources use inconsistent mutual-TLS settings. A remote unauthenticated attacker may then access backends intended to require a client certificate, unless strict TLS options are enabled.",
  "mitigation": "Upgrade Traefik to v3.7.15. Until upgraded, enable `core.strictTLSOptions` and ensure Ingress resources sharing a host use consistent mutual-TLS configuration.",
  "vendor": "go",
  "product": "go:Traefik",
  "affected": [
    {
      "affected_notes": [],
      "affected_ranges": [
        ">= v3.7.0-ea.1, <= v3.7.14"
      ],
      "ecosystem": "go",
      "fixed_versions": [
        "v3.7.15"
      ],
      "package_name": "Traefik",
      "purl": "pkg:golang/Traefik"
    }
  ],
  "cwes": [
    287
  ],
  "cvss_score": 7,
  "cvss_src": "cna_vendor",
  "cvss_vector": "CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:N/SC:H/SI:H/SA:N",
  "epss_score": null,
  "epss_percentile": null,
  "epss_asof": null,
  "automation": "contextual",
  "check": false,
  "check_confidence_basis": null,
  "exploit": false,
  "pipeline_minutes": 87.84203486666667,
  "t0_at": null,
  "signals": {
    "trigger_signal": {
      "at": "2026-10-16T08:00:58+00:00",
      "days": -5.2332718328125,
      "is_lower_bound": true,
      "measured_at": "2026-10-21T13:36:52.823246+00:00",
      "url": "https://github.com/traefik/traefik/security/advisories/GHSA-p8wx-ph99-xgcr"
    }
  }
}