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CVE details

CVE-2026-42583

Netty is an asynchronous, event-driven network application framework. Prior to 4.2.13.Final and 4.1.133.Final, Lz4FrameDecoder allocates a ByteBuf of size decompressedLength (up to 32 MB per block) before LZ4 runs. A peer only needs a 21-byte header plus compressedLength payload bytes - 22 bytes if compressedLength == 1 - to force that allocation. This vulnerability is fixed in 4.2.13.Final and 4.1.133.Final.

Score
7.5 high
Published
2026-05-13
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>4.1.133</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 4.2.13.Final and 4.1.133.Final, Lz4FrameDecoder allocates a
	ByteBuf of size decompressedLength (up to 32 MB per block) before LZ4
	runs. A peer only needs a 21-byte header plus compressedLength payload
	bytes - 22 bytes if compressedLength == 1 - to force that allocation.
	This vulnerability is fixed in 4.2.13.Final and 4.1.133.Final.</p>
      </body>
    </description>
    <references>
      <cvename>CVE-2026-42583</cvename>
      <url>https://nvd.nist.gov/vuln/detail/CVE-2026-42583</url>
    </references>
    <dates>
      <discovery>2026-05-13</discovery>
      <entry>2026-10-25</entry>
    </dates>
  </vuln>