{
  "affected": [
    {
      "ranges": [
        {
          "database_specific": {
            "versions": [
              {
                "introduced": "0"
              },
              {
                "last_affected": "3.8"
              }
            ]
          },
          "events": [
            {
              "introduced": "0"
            },
            {
              "last_affected": "b34e1d03387be771aa626241fe56f8f0c34243f2"
            }
          ],
          "repo": "https://github.com/Python-Markdown/markdown",
          "type": "GIT"
        }
      ]
    }
  ],
  "details": "Python-Markdown version 3.8 contain a vulnerability where malformed HTML-like sequences can cause html.parser.HTMLParser to raise an unhandled AssertionError during Markdown parsing. Because Python-Markdown does not catch this exception, any application that processes attacker-controlled Markdown may crash. This enables remote, unauthenticated Denial of Service in web applications, documentation systems, CI/CD pipelines, and any service that renders untrusted Markdown. The issue was acknowledged by the vendor and fixed in version 3.8.1. This issue causes a remote Denial of Service in any application parsing untrusted Markdown, and can lead to Information Disclosure through uncaught exceptions.",
  "id": "CVE-2025-69534",
  "modified": "2026-03-14T13:48:27.445349546Z",
  "published": "2026-03-05T15:16:11.243Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/Python-Markdown/markdown/actions/runs/15736122892"
    },
    {
      "type": "ADVISORY",
      "url": "http://www.openwall.com/lists/oss-security/2026/03/06/4"
    },
    {
      "type": "REPORT",
      "url": "https://github.com/Python-Markdown/markdown/issues/1534"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/Python-Markdown/markdown"
    }
  ],
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
      "type": "CVSS_V3"
    }
  ]
}