CRLF injection in Netty - CVE-2026-59919

Vulnerability identifier: #VU138902

CSH Severity: Low

CVSS v4: 6.8 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N]

CVE-ID: CVE-2026-59919

CWE-ID: CWE-93

Exploitation vector: Local access

Exploit availability: Public exploit is available

The vulnerability allows a local user to inject arbitrary data in server response.

The vulnerability exists due to insufficient validation of attacker-supplied data within AF_UNIX address. A local user can pass specially crafted data to the application containing CR-LF characters and modify application behavior.

Netty
SUSE Linux Enterprise Server 15 SP6
SUSE Linux Enterprise Server 15 SP5
SUSE Linux Enterprise Server 15 SP4
SUSE Linux Enterprise Server for SAP Applications 15
SUSE Linux Enterprise High Performance Computing 15
SUSE Linux Enterprise High Performance Computing ESPOS 15
SUSE Linux Enterprise High Performance Computing LTSS 15
SUSE Linux Enterprise Server 15
SUSE Linux Enterprise Desktop 15
SUSE Linux Enterprise Real Time 15
Development Tools Module
SUSE Package Hub 15
netty-tcnative-debugsource
netty-tcnative
netty
netty-javadoc

Install updates from vendor's website.

Netty - addressed in versions 4.1.136, 4.2.16
netty-tcnative-debugsource - update to 2.0.80-150200.3.48.1
netty-tcnative - update to 2.0.80-150200.3.48.1
netty - update to 4.1.136-150200.4.53.1
netty-javadoc - update to 4.1.136-150200.4.53.1

• Exploit #12831 - HAProxy V1 Protocol CRLF Injection via AF_UNIX Address (July 21, 2026)

• https://github.com/netty/netty/security/advisories/GHSA-wh89-7897-x99h

• Multiple vulnerabilities in Netty
• SUSE update for netty, netty-tcnative