ETK-2026-978Zero's internal tracking ID, independent of the CVE number.

{
  "etk_id": "ETK-2026-978",
  "cve_id": null,
  "display_id": "ETK-2026-978",
  "ghsa_id": "GHSA-cw35-4q88-3rmp",
  "euvd_id": null,
  "status": "published",
  "anchor_state": "awaiting_cve",
  "title": "Traefik backend connection reuse TLS policy bypass",
  "summary": "Traefik versions with NTLM or Kerberos backend authentication can incorrectly reuse backend connection state across services that have different ServersTransport TLS configurations. An unauthenticated client using a persistent connection may cause requests to one backend to bypass its intended TLS validation settings or use another backend's client certificate.",
  "mitigation": "Upgrade Traefik v2 to v2.11.58 or later, or upgrade v3 to v3.7.14 or later. Move deployments on v3.0 through v3.6 to v3.7.14, as those releases are no longer patched.",
  "vendor": "go",
  "product": "go:Traefik",
  "affected": [
    {
      "affected_notes": [],
      "affected_ranges": [
        ">= v2.11.0, <= v2.11.57"
      ],
      "ecosystem": "go",
      "fixed_versions": [
        "v2.11.58"
      ],
      "package_name": "Traefik",
      "purl": "pkg:golang/Traefik"
    },
    {
      "affected_notes": [],
      "affected_ranges": [
        ">= v3.0.0, <= v3.7.13"
      ],
      "ecosystem": "go",
      "fixed_versions": [
        "v3.7.14"
      ],
      "package_name": "Traefik",
      "purl": "pkg:golang/Traefik"
    }
  ],
  "cwes": [
    295
  ],
  "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": "deterministic",
  "check": true,
  "check_confidence_basis": "differential",
  "exploit": false,
  "pipeline_minutes": 22.060858716666665,
  "t0_at": null,
  "signals": {
    "check": {
      "at": "2026-10-08T15:00:49.034632+00:00",
      "days": -13.315980738043981,
      "is_lower_bound": true,
      "measured_at": "2026-10-21T22:35:49.867721+00:00",
      "url": null
    },
    "trigger_signal": {
      "at": "2026-10-07T08:47:34+00:00",
      "days": -14.575182527766204,
      "is_lower_bound": true,
      "measured_at": "2026-10-21T22:35:49.867721+00:00",
      "url": "https://github.com/traefik/traefik/security/advisories/GHSA-cw35-4q88-3rmp"
    }
  }
}