BREW-GOBJECT-INTROSPECTI… (GHSA-5WMX-573V-2QWQ)

Vulnerability from osv_homebrew – Published: 2026-08-13 16:53 – Updated: 2026-09-10 00:03 – Source website
VLAI
Summary
Python-Markdown has an Uncaught Exception
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.

Severity
7.5 (High)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
5.5 (Medium)
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:P
References
To clipboard 

{
  "affected": [
    {
      "ecosystem_specific": {
        "fix": "bump",
        "range_state": "fixed",
        "resource": "markdown",
        "resource_purl": "pkg:pypi/markdown@3.10.2",
        "upstream_fixed_in": "3.8.1"
      },
      "package": {
        "ecosystem": "Homebrew",
        "name": "gobject-introspection",
        "purl": "pkg:brew/gobject-introspection"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "1.86.0_3"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "database_specific": {
    "confidence": "high",
    "source": "matched",
    "strategy": "registry",
    "upstream_evidence": [
      {
        "ecosystem": "PyPI",
        "key": "pkg:pypi/markdown@3.10.2",
        "name": "markdown",
        "resource": "markdown",
        "strategy": "registry",
        "subject_version": "3.10.2"
      }
    ]
  },
  "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": "BREW-gobject-introspection-CVE-2025-69534",
  "modified": "2026-09-10T00:03:47Z",
  "published": "2026-08-13T16:53:14Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2025-69534"
    },
    {
      "type": "WEB",
      "url": "https://github.com/Python-Markdown/markdown/issues/1534"
    },
    {
      "type": "WEB",
      "url": "https://github.com/Python-Markdown/markdown/pull/1535"
    },
    {
      "type": "WEB",
      "url": "https://github.com/Python-Markdown/markdown"
    },
    {
      "type": "WEB",
      "url": "https://github.com/Python-Markdown/markdown/actions/runs/15736122892"
    },
    {
      "type": "WEB",
      "url": "https://github.com/pypa/advisory-database/tree/main/vulns/markdown/PYSEC-2026-89.yaml"
    },
    {
      "type": "WEB",
      "url": "http://www.openwall.com/lists/oss-security/2026/03/06/4"
    }
  ],
  "schema_version": "1.7.3",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
      "type": "CVSS_V3"
    },
    {
      "score": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:P",
      "type": "CVSS_V4"
    }
  ],
  "summary": "Python-Markdown has an Uncaught Exception",
  "upstream": [
    "GHSA-5wmx-573v-2qwq",
    "CVE-2025-69534",
    "PYSEC-2026-89"
  ]
}



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