CVE-2026-89418

{
  "etk_id": "ETK-2026-216",
  "cve_id": "CVE-2026-89418",
  "display_id": "CVE-2026-89418",
  "ghsa_id": "GHSA-5h29-r2cp-hfmr",
  "euvd_id": "EUVD-2026-81523",
  "status": "published",
  "anchor_state": "anchored",
  "title": "Unbounded recursion denial of service in google-protobuf",
  "summary": "google-protobuf versions before 4.0.3 can exhaust the Node.js call stack while parsing unknown protobuf group fields. An unauthenticated attacker can crash a service if it accepts attacker-controlled protobuf bytes through generated deserialization APIs or BinaryReader.",
  "mitigation": "Upgrade google-protobuf to version 4.0.3 or later. Until upgraded, restrict untrusted protobuf input from reaching affected deserialization paths.",
  "vendor": "npm",
  "product": "npm:google-protobuf",
  "affected": [
    {
      "affected_notes": [],
      "affected_ranges": [
        "<= 4.0.2"
      ],
      "ecosystem": "npm",
      "fixed_versions": [
        "4.0.3"
      ],
      "package_name": "google-protobuf",
      "purl": "pkg:npm/google-protobuf"
    }
  ],
  "cwes": [
    674
  ],
  "cvss_score": 8.7,
  "cvss_src": "cna_vendor",
  "cvss_vector": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N",
  "epss_score": 0.0028,
  "epss_percentile": 0.1896,
  "epss_asof": "2026-10-20",
  "automation": "deterministic",
  "check": false,
  "check_confidence_basis": null,
  "exploit": false,
  "pipeline_minutes": 20.211802933333335,
  "t0_at": "2026-09-17T13:27:30.163000+00:00",
  "signals": {
    "public_poc": {
      "at": "2026-09-17T13:14:56+00:00",
      "days": -0.008728738425925926,
      "is_lower_bound": false,
      "measured_at": "2026-09-17T13:27:30.163000+00:00",
      "url": "https://github.com/protocolbuffers/protobuf-javascript/security/advisories/GHSA-5h29-r2cp-hfmr"
    },
    "trigger_signal": {
      "at": "2026-09-17T13:27:30.163000+00:00",
      "days": 0,
      "is_lower_bound": false,
      "measured_at": "2026-09-17T13:27:30.163000+00:00",
      "url": "https://github.com/protocolbuffers/protobuf-javascript/security/advisories/GHSA-5h29-r2cp-hfmr"
    }
  }
}