CVE-2026-59900

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>netty</name>
	<range><lt>4.1.136</lt></range>
      </package>
    </affects>
    <description>
      <body xmlns="http://www.w3.org/1999/xhtml">
	<p>Netty is an asynchronous, event-driven network application framework.
	Prior to versions 4.1.136.Final and 4.2.16.Final, Netty's
	HTTP/2-to-HTTP/1.x translation layer
	(`Http2StreamFrameToHttpObjectCodec` and `InboundHttp2ToHttpAdapter`)
	fails to deduplicate or validate `Host` headers when an HTTP/2 client
	supplies both the `:authority` pseudo-header and a literal `host`
	header in a single HEADERS frame. The translator maps `:authority` to
	`Host` and separately copies the literal `host` header, producing an
	`HttpRequest` object containing two `Host` headers with
	attacker-controlled differing values. This issue has been fixed in
	versions 4.1.136.Final and 4.2.16.Final.</p>
      </body>
    </description>
    <references>
      <cvename>CVE-2026-59900</cvename>
      <url>https://nvd.nist.gov/vuln/detail/CVE-2026-59900</url>
    </references>
    <dates>
      <discovery>2026-07-29</discovery>
      <entry>2026-10-25</entry>
    </dates>
  </vuln>