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CVE details

CVE-2026-45673

Netty is a network application framework for development of protocol servers and clients. Prior to versions 4.1.135.Final and 4.2.15.Final, Netty's DNS resolver uses a predictable PRNG for generating DNS transaction IDs and defaults to a static UDP source port. This combination reduces the entropy of DNS queries, enabling DNS Cache Poisoning (Kaminsky attack). Versions 4.1.135.Final and 4.2.15.Final patch the issue.

Score
6.8 medium
Published
2026-06-12
Links
NVD · cve.org

Affected ports (1)

PortPackageVersionStatusMaintainer
java/nettynetty4.1.53_2unaddressedglewis@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>netty</name>
	<range><lt>4.1.135</lt></range>
      </package>
    </affects>
    <description>
      <body xmlns="http://www.w3.org/1999/xhtml">
	<p>Netty is a network application framework for development of protocol
	servers and clients. Prior to versions 4.1.135.Final and 4.2.15.Final,
	Netty's DNS resolver uses a predictable PRNG for generating DNS
	transaction IDs and defaults to a static UDP source port. This
	combination reduces the entropy of DNS queries, enabling DNS Cache
	Poisoning (Kaminsky attack). Versions 4.1.135.Final and 4.2.15.Final
	patch the issue.</p>
      </body>
    </description>
    <references>
      <cvename>CVE-2026-45673</cvename>
      <url>https://nvd.nist.gov/vuln/detail/CVE-2026-45673</url>
    </references>
    <dates>
      <discovery>2026-06-12</discovery>
      <entry>2026-10-25</entry>
    </dates>
  </vuln>