ETK-2026-4385Zero's internal tracking ID, independent of the CVE number.

{
  "etk_id": "ETK-2026-4385",
  "cve_id": null,
  "display_id": "ETK-2026-4385",
  "ghsa_id": "GHSA-xw3h-pgr9-3vg7",
  "euvd_id": null,
  "status": "published",
  "anchor_state": "awaiting_cve",
  "title": "Blocking-write denial of service in Puma reactor",
  "summary": "Puma releases before 7.2.2 or 8.0.3 can let an unauthenticated client stall a worker's reactor, delaying service for connections managed by that worker. Exposure exists with the default settings when Puma is directly reachable by untrusted clients and the application has an endpoint with client-influenced response size. A response-buffering reverse proxy prevents this condition.",
  "mitigation": "Upgrade Puma to 7.2.2 or 8.0.3. Until upgraded, place Puma behind a reverse proxy that buffers requests and responses, and do not expose its listener directly to untrusted clients.",
  "vendor": "rubygems",
  "product": "rubygems:puma",
  "affected": [
    {
      "affected_notes": [],
      "affected_ranges": [
        ">= 8.0.0, < 8.0.3"
      ],
      "ecosystem": "rubygems",
      "fixed_versions": [
        "8.0.3"
      ],
      "package_name": "puma",
      "purl": "pkg:gem/puma"
    },
    {
      "affected_notes": [],
      "affected_ranges": [
        ">= 3.8.0, < 7.2.2"
      ],
      "ecosystem": "rubygems",
      "fixed_versions": [
        "7.2.2"
      ],
      "package_name": "puma",
      "purl": "pkg:gem/puma"
    }
  ],
  "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": 13.27447035,
  "t0_at": null,
  "signals": {
    "trigger_signal": {
      "at": "2026-11-13T05:12:20+00:00",
      "days": -0.6165113781134259,
      "is_lower_bound": true,
      "measured_at": "2026-11-13T20:00:06.628255+00:00",
      "url": "https://github.com/puma/puma/security/advisories/GHSA-xw3h-pgr9-3vg7"
    }
  }
}