CVE-2026-111758

{
  "etk_id": "ETK-2026-2218",
  "cve_id": "CVE-2026-111758",
  "display_id": "CVE-2026-111758",
  "ghsa_id": "GHSA-gfr2-rv44-r23c",
  "euvd_id": "EUVD-2026-105358",
  "status": "published",
  "anchor_state": "anchored",
  "title": "Quadratic parsing denial of service in markdown-it",
  "summary": "markdown-it versions 14.1.0 through 14.3.2 and 15.0.0 through 15.0.2 may consume disproportionate CPU when parsing malformed Markdown reference definitions. An attacker who can submit Markdown to a service can delay the Node.js event loop with unterminated reference labels or titles; default parser settings are affected.",
  "mitigation": "Upgrade markdown-it to version 14.3.3 or 15.0.3, or a later release. Until upgraded, disable reference parsing for untrusted Markdown and enforce request-size limits.",
  "vendor": "npm",
  "product": "markdown-it",
  "affected": [
    {
      "affected_notes": [],
      "affected_ranges": [
        ">= 14.1.0, < 14.3.3"
      ],
      "ecosystem": "npm",
      "fixed_versions": [
        "14.3.3"
      ],
      "package_name": "markdown-it",
      "purl": "pkg:npm/markdown-it"
    },
    {
      "affected_notes": [],
      "affected_ranges": [
        ">= 15.0.0, < 15.0.3"
      ],
      "ecosystem": "npm",
      "fixed_versions": [
        "15.0.3"
      ],
      "package_name": "markdown-it",
      "purl": "pkg:npm/markdown-it"
    }
  ],
  "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": "contextual",
  "check": true,
  "check_confidence_basis": "assessed",
  "exploit": false,
  "pipeline_minutes": 7.97380385,
  "t0_at": "2026-10-20T20:28:40.677000+00:00",
  "signals": {
    "check": {
      "at": "2026-10-20T20:47:10.107616+00:00",
      "days": 0.01284063212962963,
      "is_lower_bound": false,
      "measured_at": "2026-10-20T20:28:40.677000+00:00",
      "url": null
    },
    "public_poc": {
      "at": "2026-10-20T20:28:44+00:00",
      "days": 0.00003846064814814815,
      "is_lower_bound": false,
      "measured_at": "2026-10-20T20:28:40.677000+00:00",
      "url": "https://github.com/advisories/GHSA-gfr2-rv44-r23c"
    },
    "trigger_signal": {
      "at": "2026-10-20T20:28:40.677000+00:00",
      "days": 0,
      "is_lower_bound": false,
      "measured_at": "2026-10-20T20:28:40.677000+00:00",
      "url": "https://github.com/advisories/GHSA-gfr2-rv44-r23c"
    }
  }
}