Resource exhaustion in Netty - CVE-2026-44890

Vulnerability identifier: #VU133459

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-2026-44890

CWE-ID: CWE-400

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 uncontrolled resource consumption in RedisDecoder when processing crafted Redis payloads that omit the required \r\n terminator. A remote attacker can send specially crafted Redis payloads across multiple concurrent connections to cause a denial of service.

Exploitation requires multiple concurrent connections to exhaust the direct memory pool and trigger an OutOfDirectMemoryError.

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
Netezza Appliance
netty-tcnative
netty-tcnative-debugsource
netty-javadoc
netty
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
netty-tcnative - update to 2.0.79-150200.3.45.1
netty-tcnative-debugsource - update to 2.0.79-150200.3.45.1
netty-javadoc - update to 4.1.135-150200.4.50.1
netty - update to 4.1.135-150200.4.50.1
JBoss Data Grid - update to 8.6.2

• https://github.com/netty/netty/security/advisories/GHSA-6ghj-frrj-jjj3

• Multiple vulnerabilities in Netty
• SUSE update for netty, netty-tcnative
• Multiple vulnerabilities in JBoss Data Grid 8.6
• Multiple vulnerabilities in IBM Netezza Appliance