{
  "cve": [
    "CVE-2026-21636"
  ],
  "vulnerable": "25.x",
  "patched": "^25.3.0",
  "ref": "https://nodejs.org/en/blog/vulnerability/december-2025-security-releases",
  "description": "Node.js permission model bypass via unchecked Unix Domain Socket connections (UDS)",
  "overview": "A flaw in Node.js's permission model allows Unix Domain Socket (UDS) connections to bypass network restrictions when `--permission` is enabled. Even without `--allow-net`, 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 (`--allow-net`) are still in the experimental phase.\n",
  "affectedEnvironments": [
    "all"
  ],
  "severity": "medium"
}