ETK-2026-2554Zero's internal tracking ID, independent of the CVE number.

{
  "etk_id": "ETK-2026-2554",
  "cve_id": null,
  "display_id": "ETK-2026-2554",
  "ghsa_id": "GHSA-vg7p-vv4q-4272",
  "euvd_id": null,
  "status": "published",
  "anchor_state": "awaiting_cve",
  "title": "HTTP/2 deferred timer use-after-free in H2O",
  "summary": "H2O may access released request state when a deferred error timer executes after an HTTP/2 stream has been reset. Exposure requires reproxy or error-document handling that can generate an invalid delegated redirect, along with an attacker able to reset an HTTP/2 stream.",
  "mitigation": "Upgrade h2o to commits 7f76f0d and above or later.",
  "vendor": "other",
  "product": "other:h2o",
  "affected": [
    {
      "affected_notes": [
        "commits up to ae55300"
      ],
      "affected_ranges": [],
      "ecosystem": "other",
      "fixed_versions": [
        "commits 7f76f0d and above"
      ],
      "package_name": "h2o",
      "purl": null
    }
  ],
  "cwes": null,
  "cvss_score": 7.5,
  "cvss_src": "cna_vendor",
  "cvss_vector": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
  "epss_score": null,
  "epss_percentile": null,
  "epss_asof": null,
  "automation": "deterministic",
  "check": false,
  "check_confidence_basis": null,
  "exploit": false,
  "pipeline_minutes": 19.32968245,
  "t0_at": null,
  "signals": {
    "trigger_signal": {
      "at": "2026-10-23T08:55:43+00:00",
      "days": -1.5886672316087962,
      "is_lower_bound": true,
      "measured_at": "2026-10-24T23:03:23.874541+00:00",
      "url": "https://github.com/h2o/h2o/security/advisories/GHSA-vg7p-vv4q-4272"
    }
  }
}