ETK-2026-2921Zero's internal tracking ID, independent of the CVE number.

{
  "etk_id": "ETK-2026-2921",
  "cve_id": null,
  "display_id": "ETK-2026-2921",
  "ghsa_id": "GHSA-4mfg-r38w-w8fg",
  "euvd_id": null,
  "status": "published",
  "anchor_state": "awaiting_cve",
  "title": "SSRF bypass in mcp-sanitizer URL validation",
  "summary": "mcp-sanitizer URL validation can allow requests to localhost and IPv6 loopback or link-local services when applications use it to approve outbound URLs. An attacker who can control a URL accepted by the sanitizer may obtain responses from internal services.",
  "mitigation": "Upgrade mcp-sanitizer to version 1.4.0 or later. Until upgraded, independently block loopback, link-local, and other internal destinations after URL parsing and before making outbound requests.",
  "vendor": "npm",
  "product": "npm:mcp-sanitizer",
  "affected": [
    {
      "affected_notes": [],
      "affected_ranges": [
        "< 1.4.0"
      ],
      "ecosystem": "npm",
      "fixed_versions": [
        "1.4.0"
      ],
      "package_name": "mcp-sanitizer",
      "purl": "pkg:npm/mcp-sanitizer"
    }
  ],
  "cwes": null,
  "cvss_score": 8.2,
  "cvss_src": "cna_vendor",
  "cvss_vector": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:L/A:N",
  "epss_score": null,
  "epss_percentile": null,
  "epss_asof": null,
  "automation": "deterministic",
  "check": false,
  "check_confidence_basis": null,
  "exploit": false,
  "pipeline_minutes": 11.874576166666667,
  "t0_at": null,
  "signals": {
    "public_poc": {
      "at": "2026-10-28T19:51:39+00:00",
      "days": -1.461942089988426,
      "is_lower_bound": true,
      "measured_at": "2026-10-30T06:56:50.915263+00:00",
      "url": "https://github.com/advisories/GHSA-4mfg-r38w-w8fg"
    },
    "trigger_signal": {
      "at": "2026-10-28T19:51:39+00:00",
      "days": -1.461942089988426,
      "is_lower_bound": true,
      "measured_at": "2026-10-30T06:56:50.915263+00:00",
      "url": "https://github.com/advisories/GHSA-4mfg-r38w-w8fg"
    }
  }
}