ETK-2026-3518Zero's internal tracking ID, independent of the CVE number.

{
  "etk_id": "ETK-2026-3518",
  "cve_id": null,
  "display_id": "ETK-2026-3518",
  "ghsa_id": "GHSA-2gff-2mmg-m73p",
  "euvd_id": null,
  "status": "published",
  "anchor_state": "awaiting_cve",
  "title": "Client IP spoofing in ActionDispatch::RemoteIp",
  "summary": "Actionpack versions 8.1.0 through 8.1.4 can derive an attacker-selected client address when running with Rack 3 behind a proxy that forwards untrusted Forwarded headers. An unauthenticated requester may evade IP-based policy or throttling and cause inaccurate client-IP audit records when the application relies on request.remote_ip.",
  "mitigation": "Upgrade actionpack to 8.1.4.1. Configure every reverse proxy to discard or replace inbound Forwarded headers before passing requests to the application.",
  "vendor": "rubygems",
  "product": "rubygems:actionpack",
  "affected": [
    {
      "affected_notes": [],
      "affected_ranges": [
        ">= 8.1, < 8.1.4.1"
      ],
      "ecosystem": "rubygems",
      "fixed_versions": [
        "8.1.4.1"
      ],
      "package_name": "actionpack",
      "purl": "pkg:gem/actionpack"
    }
  ],
  "cwes": [
    348
  ],
  "cvss_score": 7.4,
  "cvss_src": "cna_vendor",
  "cvss_vector": "CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N",
  "epss_score": null,
  "epss_percentile": null,
  "epss_asof": null,
  "automation": "contextual",
  "check": true,
  "check_confidence_basis": "assessed",
  "exploit": false,
  "pipeline_minutes": 10.6341445,
  "t0_at": null,
  "signals": {
    "check": {
      "at": "2026-11-04T16:45:03.630311+00:00",
      "days": -0.25197065395833335,
      "is_lower_bound": true,
      "measured_at": "2026-11-04T22:47:54.071164+00:00",
      "url": null
    },
    "trigger_signal": {
      "at": "2026-11-04T03:01:54+00:00",
      "days": -0.8236098936689815,
      "is_lower_bound": true,
      "measured_at": "2026-11-04T22:47:54.071164+00:00",
      "url": "https://github.com/rails/rails/security/advisories/GHSA-2gff-2mmg-m73p"
    }
  }
}