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CVE details

CVE-2026-47736

Puma is a Ruby/Rack web server built for parallelism. From 5.5.0 until 7.2.1 and 8.0.2, when PROXY protocol v1 support is enabled, Puma reads incoming bytes into an internal buffer while waiting for CRLF to determine whether a PROXY v1 line is present, allowing an attacker that continuously sends bytes without CRLF to cause unbounded in-process memory growth and additional CPU cost from repeatedly scanning the growing buffer. This issue is fixed in versions 7.2.1 and 8.0.2.

Score
7.5 high
Published
2026-07-14
Links
NVD · cve.org · Report wrong data

Matched ports (1)

PortPackageVersionStatusMaintainer
www/rubygem-puma6rubygem-puma66.6.1unaddressedsunpoet@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>rubygem-puma6</name>
	<range><lt>7.2.1</lt></range>
      </package>
    </affects>
    <description>
      <body xmlns="http://www.w3.org/1999/xhtml">
	<p>Puma is a Ruby/Rack web server built for parallelism. From 5.5.0 until
	7.2.1 and 8.0.2, when PROXY protocol v1 support is enabled, Puma reads
	incoming bytes into an internal buffer while waiting for CRLF to
	determine whether a PROXY v1 line is present, allowing an attacker
	that continuously sends bytes without CRLF to cause unbounded
	in-process memory growth and additional CPU cost from repeatedly
	scanning the growing buffer. This issue is fixed in versions 7.2.1 and
	8.0.2.</p>
      </body>
    </description>
    <references>
      <cvename>CVE-2026-47736</cvename>
      <url>https://nvd.nist.gov/vuln/detail/CVE-2026-47736</url>
    </references>
    <dates>
      <discovery>2026-07-14</discovery>
      <entry>2026-10-26</entry>
    </dates>
  </vuln>