CRLF injection in Netty - CVE-2026-59920

Vulnerability identifier: #VU137577

CSH Severity: Low

CVSS v4: 7.1 [CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N]

CVE-ID: CVE-2026-59920

CWE-ID: CWE-93

Exploitation vector: Remote access

Exploit availability: No public exploit available

The vulnerability allows a remote user to inject arbitrary STOMP headers.

The vulnerability exists due to improper neutralization of crlf sequences in io.netty.handler.codec.stomp.StompSubframeEncoder when encoding CONNECT or CONNECTED frame headers with user-controlled newline characters. A remote user can supply a crafted header value containing newline characters to inject arbitrary STOMP headers.

Exploitation requires that user-controlled input is placed into header values and that the downstream STOMP broker processes the injected headers.

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 security update 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

• https://github.com/netty/netty/security/advisories/GHSA-3g8r-4pfx-jmfh
• https://stomp.github.io/stomp-specification-1.2.html

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