{
  "cveId": "CVE-2026-59926",
  "url": "https://patchblox.com/security/cve/CVE-2026-59926",
  "summary": "CVE-2026-59926 is fixed in 2 products on 1 platform, first by DEBIAN-CVE-2026-59926, released July 8, 2026. It is not reported as exploited. Patch Radar priority: Routine.",
  "title": "Mistune: XSS via unescaped class option in Admonition directive",
  "description": "Mistune is a Python Markdown parser with renderers and plugins. Prior to 3.2.1, render_admonition() in src/mistune/directives/admonition.py concatenates the Admonition directive :class: option into the HTML class attribute without escaping, allowing attribute injection and cross-site scripting even when HTMLRenderer escape mode is enabled. This issue is fixed in version 3.2.1.",
  "published": "2026-07-08T17:17:28Z",
  "severity": "Moderate",
  "cvss": 6.1,
  "cvssVector": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N",
  "cwe": "Improper Neutralization of Input During Web Page Generation (\u0027Cross-site Scripting\u0027)",
  "epss": 0.00327,
  "epssPercentile": 0.25956,
  "priority": "Routine",
  "priorityTier": 4,
  "exploited": false,
  "vendorExploited": false,
  "disclosed": false,
  "vendorAdvisory": "https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-59926",
  "fixes": [
    {
      "platform": "linux",
      "product": "mistune",
      "release": "Debian 14",
      "fixedVersion": "3.1.4-1",
      "fix": "DEBIAN-CVE-2026-59926",
      "url": "https://patchblox.com/security/fix/linux/debian-cve-2026-59926",
      "released": "2026-07-08T17:17:28Z"
    },
    {
      "platform": "linux",
      "product": "python-mistune",
      "release": "opensuse-leap 16.0",
      "fixedVersion": "3.1.3-160000.5.1",
      "fix": "OPENSUSE-SU-2026:21339-1",
      "url": "https://patchblox.com/security/fix/linux/opensuse-su-2026-21339-1",
      "released": "2026-07-14T10:41:18Z"
    },
    {
      "platform": "linux",
      "product": "python-mistune",
      "release": "sles 16.0",
      "fixedVersion": "3.1.3-160000.5.1",
      "fix": "SUSE-SU-2026:22655-1",
      "url": "https://patchblox.com/security/fix/linux/suse-su-2026-22655-1",
      "released": "2026-07-14T10:37:38Z"
    }
  ],
  "noFixYet": [],
  "dataAsOf": "2026-11-09T01:18:40Z",
  "attribution": {
    "text": "Data: Patchblox Patch Radar",
    "url": "https://patchblox.com/security/patch-radar",
    "terms": "https://patchblox.com/security/patch-radar/use-the-data"
  }
}