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CVE details

CVE-2026-47737

Puma is a Ruby/Rack web server built for parallelism. From 5.5.0 until 7.2.1 and 8.0.2, Puma is vulnerable to source IP spoofing when set_remote_address proxy_protocol: :v1 is enabled and persistent connections are used because Puma incorrectly re-parses PROXY protocol headers after each keep-alive request on the same connection, allowing an attacker to inject a second PROXY header and overwrite REMOTE_ADDR. 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

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, Puma is vulnerable to source IP spoofing when
	set_remote_address proxy_protocol: :v1 is enabled and persistent
	connections are used because Puma incorrectly re-parses PROXY protocol
	headers after each keep-alive request on the same connection, allowing
	an attacker to inject a second PROXY header and overwrite REMOTE_ADDR.
	This issue is fixed in versions 7.2.1 and 8.0.2.</p>
      </body>
    </description>
    <references>
      <cvename>CVE-2026-47737</cvename>
      <url>https://nvd.nist.gov/vuln/detail/CVE-2026-47737</url>
    </references>
    <dates>
      <discovery>2026-07-14</discovery>
      <entry>2026-10-26</entry>
    </dates>
  </vuln>