CVE details
CVE-2026-56817
Netty is a network application framework for development of protocol servers and clients. In versions 4.2.0.Final through 4.2.15.Final and 4.1.0.Final through 4.1.135.Final, any caller that can deliver bytes to a Netty channel pipeline containing `XmlDecoder` can send XML with a `DOCTYPE` declaration to an `AsyncXMLInputFactory` instantiated with no security configuration, leaving DTD and entity handling active depending on Aalto XML async parser behavior and creating conditional XML external entity risk. This issue is fixed in versions 4.1.136.Final and 4.2.16.Final.
Affected ports (1)
| Port | Package | Version | Status | Maintainer |
|---|---|---|---|---|
| java/netty | netty | 4.1.53_2 | unaddressed | glewis@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>4.1.136</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. In versions 4.2.0.Final through 4.2.15.Final and
4.1.0.Final through 4.1.135.Final, any caller that can deliver bytes
to a Netty channel pipeline containing `XmlDecoder` can send XML with
a `DOCTYPE` declaration to an `AsyncXMLInputFactory` instantiated with
no security configuration, leaving DTD and entity handling active
depending on Aalto XML async parser behavior and creating conditional
XML external entity risk. This issue is fixed in versions
4.1.136.Final and 4.2.16.Final.</p>
</body>
</description>
<references>
<cvename>CVE-2026-56817</cvename>
<url>https://nvd.nist.gov/vuln/detail/CVE-2026-56817</url>
</references>
<dates>
<discovery>2026-07-21</discovery>
<entry>2026-10-25</entry>
</dates>
</vuln>