CVE-2026-121809

{
  "etk_id": "ETK-2026-4405",
  "cve_id": "CVE-2026-121809",
  "display_id": "CVE-2026-121809",
  "ghsa_id": "GHSA-c2h9-f9cc-27xh",
  "euvd_id": "EUVD-2026-125542",
  "status": "published",
  "anchor_state": "anchored",
  "title": "Infinite loop in elixir-grpc streaming request handling",
  "summary": "grpc_server versions 1.0.0 through before 1.1.0 and grpc versions 0.3.1 through before 1.0.0 mishandle prematurely ended client-streaming and bidirectional-streaming requests. An unauthenticated remote client can tie up BEAM scheduler capacity and potentially cause service degradation when it can send such requests to an exposed gRPC endpoint.",
  "mitigation": "Upgrade grpc_server to 1.1.0 or later, or grpc to 1.0.0 or later. For elixir-grpc/grpc source-based deployments, update to revision 38955f1392cbf08eef231a347348445410455c85 or 0332faae5f5e132314794dbfdae5edecbccea292.",
  "vendor": "elixir-grpc",
  "product": "grpc_server",
  "affected": [
    {
      "affected_notes": [],
      "affected_ranges": [
        ">= 0.3.1, < 1.0.0"
      ],
      "ecosystem": "erlang",
      "fixed_versions": [
        "1.0.0"
      ],
      "package_name": "grpc",
      "purl": "pkg:hex/grpc"
    },
    {
      "affected_notes": [],
      "affected_ranges": [
        ">= 1.0.0, < 1.1.0"
      ],
      "ecosystem": "erlang",
      "fixed_versions": [
        "1.1.0"
      ],
      "package_name": "grpc_server",
      "purl": "pkg:hex/grpc_server"
    }
  ],
  "cwes": [
    400
  ],
  "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": null,
  "epss_percentile": null,
  "epss_asof": null,
  "automation": "contextual",
  "check": false,
  "check_confidence_basis": null,
  "exploit": false,
  "pipeline_minutes": 11.124184766666668,
  "t0_at": "2026-11-13T16:18:37.954000+00:00",
  "signals": {
    "trigger_signal": {
      "at": "2026-11-13T16:18:37.954000+00:00",
      "days": 0,
      "is_lower_bound": false,
      "measured_at": "2026-11-13T16:18:37.954000+00:00",
      "url": "https://www.cve.org/CVERecord?id=CVE-2026-121809"
    }
  }
}