Memory leak in Netty - CVE-2026-48059

Vulnerability identifier: #VU133440

CSH Severity: Medium

CVSS v4: 8.7 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]

CVE-ID: CVE-2026-48059

CWE-ID: CWE-401

Exploitation vector: Remote access

Exploit availability: No public exploit available

The vulnerability allows a remote attacker to cause a denial of service.

The vulnerability exists due to improper memory management in the HAProxy PROXY protocol v2 codec when parsing syntactically valid headers containing nested PP2_TYPE_SSL TLVs. A remote attacker can send a specially crafted header to cause a denial of service.

The issue occurs on the successful parse path without throwing an exception, and the underlying pooled cumulation buffer remains pinned even if the application releases the HAProxyMessage normally.

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
SUSE Package Hub 15
Development Tools Module
Netezza Appliance
IBM Sterling File Gateway
IBM Sterling B2B Integrator
Red Hat build of Quarkus
Datastax Enterprise with IBM
netty-tcnative
netty-tcnative-debugsource
netty-javadoc
netty
Red Hat Camel for Spring Boot
JBoss Data Grid

Install security update from vendor's website.

Netty - addressed in versions 4.1.135, 4.2.15
Netezza Appliance - update to 1.0.2.0
IBM Sterling File Gateway - addressed in versions 6.2.1.2.1, 6.2.2.1.1
IBM Sterling B2B Integrator - addressed in versions 6.2.1.2.1, 6.2.2.1.1
netty-tcnative - update to 2.0.79-150200.3.45.1
netty-tcnative-debugsource - update to 2.0.79-150200.3.45.1
Red Hat build of Quarkus - addressed in versions 3.27.4.SP1, 3.33.2.SP1
netty-javadoc - update to 4.1.135-150200.4.50.1
netty - update to 4.1.135-150200.4.50.1
Red Hat Camel for Spring Boot - update to 4.18
Datastax Enterprise with IBM - update to 6.9.24
JBoss Data Grid - update to 8.6.2

• https://github.com/netty/netty/security/advisories/GHSA-h2qv-fj59-j46j

• Multiple vulnerabilities in Netty
• SUSE update for netty, netty-tcnative
• Multiple vulnerabilities in Red Hat Camel for Spring Boot 4
• Multiple vulnerabilities in JBoss Data Grid 8.6
• Multiple vulnerabilities in IBM Netezza Appliance
• Multiple vulnerabilities in IBM Sterling B2B Integrator and IBM Sterling File Gateway
• Multiple vulnerabilities in IBM DataStax Enterprise
• Multiple vulnerabilities in Red Hat build of Quarkus 3.33.2
• Multiple vulnerabilities in Red Hat build of Quarkus 3.27.4