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Medium severity5.5NVD Advisory· Published Jul 29, 2026· Updated Aug 6, 2026

CVE-2026-59919

CVE-2026-59919

Description

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 packages

Versions sourced from the GitHub Security Advisory.

PackageAffected versionsPatched versions
io.netty:netty-codec-haproxyMaven
>= 4.2.0.Final, < 4.2.16.Final4.2.16.Final
io.netty:netty-codec-haproxyMaven
< 4.1.136.Final4.1.136.Final

Affected products

80

Patches

Vulnerability mechanics

References

4

News mentions

0

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