ETK-2026-2053Zero's internal tracking ID, independent of the CVE number.

{
  "etk_id": "ETK-2026-2053",
  "cve_id": null,
  "display_id": "ETK-2026-2053",
  "ghsa_id": "GHSA-qp42-r9j6-83g9",
  "euvd_id": null,
  "status": "published",
  "anchor_state": "awaiting_cve",
  "title": "Quadratic parsing denial of service in Mistune",
  "summary": "Mistune versions 3.3.0 through 3.3.3 contain quadratic-time processing in Markdown emphasis delimiter parsing. An unauthenticated attacker who can submit Markdown for rendering can consume worker CPU and delay or deny service with crafted input.",
  "mitigation": "Upgrade Mistune to version 3.3.4 or later. Until upgraded, restrict untrusted Markdown input size and apply request timeouts or resource limits to rendering workers.",
  "vendor": "pip",
  "product": "pip:mistune",
  "affected": [
    {
      "affected_notes": [],
      "affected_ranges": [
        ">= 3.3.0, < 3.3.4"
      ],
      "ecosystem": "pip",
      "fixed_versions": [
        "3.3.4"
      ],
      "package_name": "mistune",
      "purl": "pkg:pypi/mistune"
    }
  ],
  "cwes": [
    400
  ],
  "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": "contextual",
  "check": true,
  "check_confidence_basis": "assessed",
  "exploit": false,
  "pipeline_minutes": 21.603731766666666,
  "t0_at": null,
  "signals": {
    "check": {
      "at": "2026-10-19T11:53:48.796326+00:00",
      "days": -1.680752107025463,
      "is_lower_bound": true,
      "measured_at": "2026-10-21T04:14:05.864917+00:00",
      "url": null
    },
    "public_poc": {
      "at": "2026-10-19T11:05:04+00:00",
      "days": -1.7146039163541666,
      "is_lower_bound": true,
      "measured_at": "2026-10-21T04:14:05.864917+00:00",
      "url": "https://github.com/lepture/mistune/security/advisories/GHSA-qp42-r9j6-83g9"
    },
    "trigger_signal": {
      "at": "2026-10-19T11:05:04+00:00",
      "days": -1.7146039163541666,
      "is_lower_bound": true,
      "measured_at": "2026-10-21T04:14:05.864917+00:00",
      "url": "https://github.com/lepture/mistune/security/advisories/GHSA-qp42-r9j6-83g9"
    }
  }
}