CVE details
CVE-2026-59919
Netty is an asynchronous, event-driven network application framework. In versions prior to 4.1.136.Final and 4.2.16.Final, Netty's HAProxy encoder ( HAProxyMessageEncoder ) writes AF_UNIX source and destination socket addresses into the HAProxy V1 text protocol without validating them for CRLF characters, so an attacker who controls an AF_UNIX address can inject \r\n sequences and split the single PROXY header into multiple lines. This is possible because the V1 protocol uses CRLF as its line terminator and, unlike IPv4/IPv6 addresses whose format checks implicitly reject CRLF, AF_UNIX addresses are only validated for length (up to 108 bytes), allowing a forged second PROXY header line that spoofs the client source/destination IP to a downstream server or load balancer. The 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 an asynchronous, event-driven network application framework.
In versions prior to 4.1.136.Final and 4.2.16.Final, Netty's HAProxy
encoder ( HAProxyMessageEncoder ) writes AF_UNIX source and
destination socket addresses into the HAProxy V1 text protocol without
validating them for CRLF characters, so an attacker who controls an
AF_UNIX address can inject \r\n sequences and split the single
PROXY header into multiple lines. This is possible because the V1
protocol uses CRLF as its line terminator and, unlike IPv4/IPv6
addresses whose format checks implicitly reject CRLF, AF_UNIX
addresses are only validated for length (up to 108 bytes), allowing a
forged second PROXY header line that spoofs the client
source/destination IP to a downstream server or load balancer. The
issue is fixed in versions 4.1.136.Final and 4.2.16.Final.</p>
</body>
</description>
<references>
<cvename>CVE-2026-59919</cvename>
<url>https://nvd.nist.gov/vuln/detail/CVE-2026-59919</url>
</references>
<dates>
<discovery>2026-07-29</discovery>
<entry>2026-10-25</entry>
</dates>
</vuln>