{
  "canonical_id": "undici--CVE-2026-21636",
  "system_id": "undici",
  "display_name": "Undici",
  "category": "frameworks",
  "advisory_mode": "core",
  "title": "CVE-2026-21636",
  "summary": "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.",
  "published_at": "2026-01-20T21:16:05.813",
  "updated_at": "2026-01-30T20:20:56.843",
  "severity": "critical",
  "cvss_score": 10.0,
  "exploit_status": "unknown",
  "source_confidence": "ecosystem-authority",
  "official_source_url": "https://nodejs.org/en/blog/vulnerability/december-2025-security-releases",
  "secondary_source_urls": [],
  "aliases": [
    "CVE-2026-21636"
  ],
  "cve_ids": [
    "CVE-2026-21636"
  ],
  "ghsa_ids": [],
  "osv_ids": [],
  "affected_versions": [],
  "fixed_versions": [],
  "package_name": null,
  "render_markdown": false,
  "case_path": null,
  "secure_code_topics": [
    "ssrf-url-validation",
    "proxy-trust-boundary"
  ],
  "status": "triage",
  "triage_reasons": [
    "missing affected/fixed version details"
  ],
  "verification_status": "triage-manual",
  "verification_mode": "synthetic",
  "last_verified_at": null,
  "last_run_id": null,
  "evidence_bundle": null,
  "historical_status": null,
  "latest_status": null,
  "browser_evidence": {
    "required": false,
    "present": false,
    "refs": []
  },
  "repro_profile_id": "authz-bypass-generic",
  "artifact_mode": "synthetic",
  "blocked_reason": null,
  "metadata": {
    "source_names": [
      "NVD Undici"
    ],
    "source_kinds": [
      "nvd-search"
    ],
    "candidate_count": 1
  }
}