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CVE details

CVE-2025-15646

HTML::Gumbo versions before 0.19 for Perl disclose heap memory via type confusion. Support for the <template> element was added to libgumbo 0.10.0 in 2015, but the walk_tree function in lib/HTML/Gumbo.xs was not updated to support it. The element was treated as a text-node, where strlen() over-reads the heap block that the pointer addresses. Any caller that runs parse() with the default format => 'string', or with format => 'tree', on input containing a <template> element serializes the over-read bytes into the returned result, disclosing bounded heap contents. format => 'callback' reaches a croak on the unhandled node type and is unaffected.

Score
9.8 critical
Published
2026-07-01
Links
NVD · cve.org · Report wrong data

Matched ports (1)

PortPackageVersionStatusMaintainer
www/p5-HTML-Gumbop5-HTML-Gumbo0.18_1unaddressedperl@FreeBSD.org

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No CPE in the port Makefile

www/p5-HTML-Gumbo (CPE matched by the package name) has no USES=cpe. The CVE was matched through a CPE from another source, so the package and the version range may belong to a different product. Check the CVE record before using this entry.

  <vuln vid="FIXME (make newentry)">
    <topic>p5-HTML-Gumbo -- FIXME</topic>
    <affects>
      <package>
	<name>p5-HTML-Gumbo</name>
	<range><lt>0.19</lt></range>
      </package>
    </affects>
    <description>
      <body xmlns="http://www.w3.org/1999/xhtml">
	<p>CVE-2025-15646: HTML::Gumbo versions before 0.19 for Perl disclose
	  heap memory via type confusion. Support for the &lt;template&gt; element
	  was added to libgumbo 0.10.0 in 2015, but the walk_tree function in
	  lib/HTML/Gumbo.xs was not updated to support it. The element was
	  treated as a text-node, where strlen() over-reads the heap block
	  that the pointer addresses. Any caller that runs parse() with the
	  default format =&gt; 'string', or with format =&gt; 'tree', on input
	  containing a &lt;template&gt; element serializes the over-read bytes into
	  the returned result, disclosing bounded heap contents. format =&gt;
	  'callback' reaches a croak on the unhandled node type and is
	  unaffected.</p>
      </body>
    </description>
    <references>
      <cvename>CVE-2025-15646</cvename>
      <url>https://nvd.nist.gov/vuln/detail/CVE-2025-15646</url>
    </references>
    <dates>
      <discovery>2026-07-01</discovery>
      <entry>2026-11-04</entry>
    </dates>
  </vuln>