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CVE details

CVE-2026-15308

The incremental HTML parser (html.parser.HTMLParser) allows for CPU denial-of-service through repeated unterminated markup declarations when processing uncontrolled data.

Score
8.7 high
Published
2026-07-09
Links
NVD · cve.org

Affected ports (3)

PortPackageVersionStatusMaintainer
lang/linux-rl9-python3linux-rl9-python393.9.25unaddressedemulation@FreeBSD.org
lang/python27python272.7.18_5unaddressedpython@FreeBSD.org
lang/python315python3153.15.0unaddressedpython@FreeBSD.org

Template for a VuXML entry

Range taken from the CVE record, check it before committing. make newentry in security/vuxml creates the vid.

  <vuln vid="FIXME (make newentry)">
    <topic>FIXME -- FIXME</topic>
    <affects>
      <package>
	<name>linux-rl9-python39</name>
	<range><lt>3.10.21</lt></range>
      </package>
      <package>
	<name>python27</name>
	<range><lt>3.10.21</lt></range>
      </package>
      <package>
	<name>python315</name>
	<range><lt>3.10.21</lt></range>
      </package>
    </affects>
    <description>
      <body xmlns="http://www.w3.org/1999/xhtml">
	<p>The incremental HTML parser (html.parser.HTMLParser) allows for
	CPU
denial-of-service through repeated unterminated markup
	declarations when
processing uncontrolled data.</p>
      </body>
    </description>
    <references>
      <cvename>CVE-2026-15308</cvename>
      <url>https://nvd.nist.gov/vuln/detail/CVE-2026-15308</url>
    </references>
    <dates>
      <discovery>2026-07-09</discovery>
      <entry>2026-10-25</entry>
    </dates>
  </vuln>