{
  "cveId": "CVE-2026-30838",
  "url": "https://patchblox.com/security/cve/CVE-2026-30838",
  "summary": "CVE-2026-30838 is fixed in php-league-commonmark on 1 platform, first by DEBIAN-CVE-2026-30838, released March 7, 2026. It is not reported as exploited. Patch Radar priority: Routine.",
  "title": "php-league-commonmark: league/commonmark is a PHP Markdown parser",
  "description": "league/commonmark is a PHP Markdown parser. Prior to version 2.8.1, the DisallowedRawHtml extension can be bypassed by inserting a newline, tab, or other ASCII whitespace character between a disallowed HTML tag name and the closing \u003E. For example, \u003Cscript\\n\u003E would pass through unfiltered and be rendered as a valid HTML tag by browsers. This is a cross-site scripting (XSS) vector for any application that relies on this extension to sanitize untrusted user input. All applications using the DisallowedRawHtml extension to process untrusted markdown are affected. Applications that use a dedicated HTML sanitizer (such as HTML Purifier) on the rendered output are not affected. This issue has been patched in version 2.8.1.",
  "published": "2026-03-07T08:15:00Z",
  "severity": "medium",
  "cvss": 6.1,
  "cvssVector": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N",
  "epss": 0.00245,
  "epssPercentile": 0.15869,
  "priority": "Routine",
  "priorityTier": 4,
  "exploited": false,
  "vendorExploited": false,
  "disclosed": false,
  "fixes": [
    {
      "platform": "linux",
      "product": "php-league-commonmark",
      "release": "Debian 12.15 (bookworm)",
      "fixedVersion": "2.3.9-1\u002Bdeb12u1",
      "fix": "DEBIAN-CVE-2026-30838",
      "url": "https://patchblox.com/security/fix/linux/debian-cve-2026-30838",
      "released": "2026-03-07T16:15:56Z"
    },
    {
      "platform": "linux",
      "product": "php-league-commonmark",
      "release": "Debian 13.5 (trixie)",
      "fixedVersion": "2.7.0-1\u002Bdeb13u1",
      "fix": "DEBIAN-CVE-2026-30838",
      "url": "https://patchblox.com/security/fix/linux/debian-cve-2026-30838",
      "released": "2026-03-07T16:15:56Z"
    },
    {
      "platform": "linux",
      "product": "php-league-commonmark",
      "release": "Debian 14",
      "fixedVersion": "2.8.1-1",
      "fix": "DEBIAN-CVE-2026-30838",
      "url": "https://patchblox.com/security/fix/linux/debian-cve-2026-30838",
      "released": "2026-03-07T16:15:56Z"
    },
    {
      "platform": "linux",
      "product": "php-league-commonmark",
      "release": "Ubuntu 20.04 LTS (focal)",
      "fixedVersion": "1.3.1-1ubuntu2\u002Besm1",
      "fix": "php-league-commonmark 1.3.1-1ubuntu2\u002Besm1",
      "url": "https://patchblox.com/security/fix/linux/ubuntu-focal-php-league-commonmark-1.3.1-1ubuntu2-esm1",
      "released": "2026-03-24T13:16:00Z"
    },
    {
      "platform": "linux",
      "product": "php-league-commonmark",
      "release": "Ubuntu 22.04.1 LTS (jammy)",
      "fixedVersion": "1.6.7-1ubuntu0.1~esm1",
      "fix": "php-league-commonmark 1.6.7-1ubuntu0.1~esm1",
      "url": "https://patchblox.com/security/fix/linux/ubuntu-jammy-php-league-commonmark-1.6.7-1ubuntu0.1-esm1",
      "released": "2026-03-24T13:16:00Z"
    },
    {
      "platform": "linux",
      "product": "php-league-commonmark",
      "release": "Ubuntu 24.04.5 LTS (noble)",
      "fixedVersion": "2.4.2-2ubuntu0.1~esm1",
      "fix": "php-league-commonmark 2.4.2-2ubuntu0.1~esm1",
      "url": "https://patchblox.com/security/fix/linux/ubuntu-noble-php-league-commonmark-2.4.2-2ubuntu0.1-esm1",
      "released": "2026-03-24T13:16:00Z"
    }
  ],
  "noFixYet": [],
  "dataAsOf": "2026-11-08T13:06:02Z",
  "attribution": {
    "text": "Data: Patchblox Patch Radar",
    "url": "https://patchblox.com/security/patch-radar",
    "terms": "https://patchblox.com/security/patch-radar/use-the-data"
  }
}