CVE-2026-100721

{
  "etk_id": "ETK-2026-696",
  "cve_id": "CVE-2026-100721",
  "display_id": "CVE-2026-100721",
  "ghsa_id": "GHSA-5h3f-q97h-ccvc",
  "euvd_id": "EUVD-2026-87858",
  "status": "published",
  "anchor_state": "anchored",
  "title": "Path-prefix authorization bypass in vm2 NodeVM",
  "summary": "vm2 NodeVM configurations using a custom external resolver and host-context module loading can incorrectly authorize files outside the intended allowlist. An untrusted guest may cause a matching neighboring host file to be loaded and have its initialization run in the host process; attacker-controlled guest code and the affected resolver configuration are required.",
  "mitigation": "Upgrade the npm vm2 package to version 3.12.2 or later. Until upgraded, do not run untrusted code with custom external resolution combined with host-context loading.",
  "vendor": "npm",
  "product": "npm:vm2",
  "affected": [
    {
      "affected_notes": [],
      "affected_ranges": [
        "<= 3.12.1"
      ],
      "ecosystem": "npm",
      "fixed_versions": [
        "3.12.2"
      ],
      "package_name": "vm2",
      "purl": "pkg:npm/vm2"
    }
  ],
  "cwes": null,
  "cvss_score": 10,
  "cvss_src": "cna_vendor",
  "cvss_vector": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H",
  "epss_score": 0.004,
  "epss_percentile": 0.3281,
  "epss_asof": "2026-10-20",
  "automation": "contextual",
  "check": true,
  "check_confidence_basis": "mechanism_verified",
  "exploit": false,
  "pipeline_minutes": 13.971173333333333,
  "t0_at": "2026-09-27T01:28:28.596000+00:00",
  "signals": {
    "check": {
      "at": "2026-10-06T00:29:27.318249+00:00",
      "days": 8.959012988993056,
      "is_lower_bound": false,
      "measured_at": "2026-09-27T01:28:28.596000+00:00",
      "url": null
    },
    "public_poc": {
      "at": "2026-09-28T09:45:48+00:00",
      "days": 1.3453634722222223,
      "is_lower_bound": false,
      "measured_at": "2026-09-27T01:28:28.596000+00:00",
      "url": "https://github.com/murrez/CVE-2026-100721"
    },
    "trigger_signal": {
      "at": "2026-09-27T01:28:28.596000+00:00",
      "days": 0,
      "is_lower_bound": false,
      "measured_at": "2026-09-27T01:28:28.596000+00:00",
      "url": "https://github.com/advisories/GHSA-5h3f-q97h-ccvc"
    }
  }
}