ETK-2026-975Zero's internal tracking ID, independent of the CVE number.

{
  "etk_id": "ETK-2026-975",
  "cve_id": null,
  "display_id": "ETK-2026-975",
  "ghsa_id": "GHSA-mwrr-6hp4-pxr6",
  "euvd_id": null,
  "status": "published",
  "anchor_state": "awaiting_cve",
  "title": "Client-certificate header spoofing in Traefik Kubernetes provider",
  "summary": "Traefik 3.7's Kubernetes Ingress-NGINX provider can forward attacker-controlled client-certificate headers to an upstream over HTTP. An unauthenticated requester may be treated as a verified mTLS client when the affected Ingress passes certificate information upstream, disables HTTPS redirection, and its backend trusts those headers for authorization.",
  "mitigation": "Upgrade Traefik 3.7 deployments to v3.7.14 or later. Until upgraded, keep HTTPS redirection enabled for affected Ingresses and avoid authorizing requests from client-certificate headers received over HTTP.",
  "vendor": "go",
  "product": "go:Traefik",
  "affected": [
    {
      "affected_notes": [],
      "affected_ranges": [
        ">= v3.7.0, <= v3.7.13"
      ],
      "ecosystem": "go",
      "fixed_versions": [
        "v3.7.14"
      ],
      "package_name": "Traefik",
      "purl": "pkg:golang/Traefik"
    }
  ],
  "cwes": null,
  "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": true,
  "check_confidence_basis": "assessed",
  "exploit": false,
  "pipeline_minutes": 17.251016833333335,
  "t0_at": null,
  "signals": {
    "check": {
      "at": "2026-10-08T14:09:03.806141+00:00",
      "days": -13.394176267152778,
      "is_lower_bound": true,
      "measured_at": "2026-10-21T23:36:40.658722+00:00",
      "url": null
    },
    "trigger_signal": {
      "at": "2026-10-07T08:47:36+00:00",
      "days": -14.617414764155093,
      "is_lower_bound": true,
      "measured_at": "2026-10-21T23:36:40.658722+00:00",
      "url": "https://github.com/traefik/traefik/security/advisories/GHSA-mwrr-6hp4-pxr6"
    }
  }
}