{
  "cveId": "CVE-2026-21636",
  "url": "https://patchblox.com/security/cve/CVE-2026-21636",
  "summary": "CVE-2026-21636 is fixed in Node.js on 1 platform by Node.js 25.3.0 (version 25.3.0), released January 12, 2026. It is not reported as exploited. Patch Radar priority: Urgent.",
  "title": "Node.js: Improper Access Control",
  "description": "A flaw in Node.js\u0027s permission model allows Unix Domain Socket (UDS) connections to bypass network restrictions when \u0060--permission\u0060 is enabled. Even without \u0060--allow-net\u0060, attacker-controlled inputs (such as URLs or socketPath options) can connect to arbitrary local sockets via net, tls, or undici/fetch. This breaks the intended security boundary of the permission model and enables access to privileged local services, potentially leading to privilege escalation, data exposure, or local code execution.\n\n* The issue affects users of the Node.js permission model on version v25.\n\nIn the moment of this vulnerability, network permissions (\u0060--allow-net\u0060) are still in the experimental phase.",
  "published": "2026-01-20T21:16:05Z",
  "severity": "",
  "cvss": 10,
  "cwe": "CWE-284: Improper Access Control",
  "epss": 0.0087,
  "epssPercentile": 0.5904,
  "priority": "Urgent",
  "priorityTier": 2,
  "exploited": false,
  "vendorExploited": false,
  "disclosed": false,
  "vendorAdvisory": "https://nvd.nist.gov/vuln/detail/CVE-2026-21636",
  "fixes": [
    {
      "platform": "windows-app",
      "product": "Node.js",
      "fixedVersion": "25.3.0",
      "fix": "Node.js 25.3.0",
      "url": "https://patchblox.com/security/fix/windows-app/openjs.nodejs-25.3.0",
      "released": "2026-01-12T00:00:00Z"
    }
  ],
  "noFixYet": [],
  "dataAsOf": "2026-11-08T19:12:23Z",
  "attribution": {
    "text": "Data: Patchblox Patch Radar",
    "url": "https://patchblox.com/security/patch-radar",
    "terms": "https://patchblox.com/security/patch-radar/use-the-data"
  }
}