CVE-2026-104635

{
  "etk_id": "ETK-2026-1058",
  "cve_id": "CVE-2026-104635",
  "display_id": "CVE-2026-104635",
  "ghsa_id": "GHSA-m497-c2h9-rvw6",
  "euvd_id": "EUVD-2026-95562",
  "status": "published",
  "anchor_state": "anchored",
  "title": "Uncontrolled recursion in protobuf JSON decoding",
  "summary": "The protobuf Hex package before 0.17.1 can exhaust a decoding process while handling deeply nested JSON for self-referential or cyclic message types. An unauthenticated remote client can trigger a denial of service when an application accepts attacker-controlled JSON through the affected protobuf JSON decoding APIs.",
  "mitigation": "Upgrade protobuf to >= 0.17.1 or later.",
  "vendor": "elixir-protobuf",
  "product": "protobuf",
  "affected": [
    {
      "affected_notes": [],
      "affected_ranges": [
        ">= 0.8.0, <= 0.17.0"
      ],
      "ecosystem": "erlang",
      "fixed_versions": [
        ">= 0.17.1"
      ],
      "package_name": "protobuf",
      "purl": "pkg:hex/protobuf"
    }
  ],
  "cwes": [
    674
  ],
  "cvss_score": 8.2,
  "cvss_src": "cna_vendor",
  "cvss_vector": "CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N",
  "epss_score": 0.0039,
  "epss_percentile": 0.3137,
  "epss_asof": "2026-10-20",
  "automation": "contextual",
  "check": false,
  "check_confidence_basis": null,
  "exploit": false,
  "pipeline_minutes": 15.283142833333333,
  "t0_at": "2026-10-09T08:17:52.372000+00:00",
  "signals": {
    "public_poc": {
      "at": "2026-10-09T07:39:10+00:00",
      "days": -0.026879305555555556,
      "is_lower_bound": false,
      "measured_at": "2026-10-09T08:17:52.372000+00:00",
      "url": "https://github.com/elixir-protobuf/protobuf/security/advisories/GHSA-m497-c2h9-rvw6"
    },
    "trigger_signal": {
      "at": "2026-10-09T08:17:52.372000+00:00",
      "days": 0,
      "is_lower_bound": false,
      "measured_at": "2026-10-09T08:17:52.372000+00:00",
      "url": "https://www.cve.org/CVERecord?id=CVE-2026-104635"
    }
  }
}