Allocation of Resources Without Limits or Throttling in Netty - CVE-2026-42583

Vulnerability identifier: #VU130206

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-2026-42583

CWE-ID: CWE-770

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 io.netty.handler.codec.compression.Lz4FrameDecoder#decode when processing crafted LZ4 frames. A remote attacker can send a specially crafted compressed frame header and payload to cause a denial of service.

On the compressed path, header fields are trusted for sizing, allowing a small request to force allocation of a much larger ByteBuf.

Netty
SUSE Linux Enterprise Server 15 SP6
SUSE Linux Enterprise Server 15 SP5
SUSE Linux Enterprise Server 15 SP4
SUSE Linux Enterprise High Performance Computing LTSS 15
SUSE Linux Enterprise Server for SAP Applications 15
SUSE Linux Enterprise High Performance Computing ESPOS 15
SUSE Linux Enterprise High Performance Computing 15
SUSE Linux Enterprise Server 15
SUSE Linux Enterprise Real Time 15
SUSE Linux Enterprise Desktop 15
SUSE Package Hub 15
Development Tools Module
Voice Gateway
IBM SPSS Analytic Server
Jira Service Management Data Center
Crowd Data Center
Confluence Data Center
Bamboo Data Center
Rational Performance Tester
DevOps Test Performance
Storage Protect Server
IBM DB2
netty-tcnative-debugsource
netty-tcnative
netty
netty-javadoc

Install security update from vendor's website.

Netty - addressed in versions 4.1.133, 4.2.13
Voice Gateway - update to 1.0.8.27
Jira Service Management Data Center - addressed in versions 10.3.22, 11.3.7
Crowd Data Center - update to 7.2.1
Confluence Data Center - addressed in versions 9.2.22, 10.2.14
Bamboo Data Center - addressed in versions 10.2.20, 12.1.8
DevOps Test Performance - update to 11.0.8
netty-tcnative-debugsource - update to 2.0.77-150200.3.39.1
netty-tcnative - update to 2.0.77-150200.3.39.1
netty - update to 4.1.133-150200.4.46.1
netty-javadoc - update to 4.1.133-150200.4.46.1
Storage Protect Server - update to 8.2.2

• https://github.com/netty/netty/security/advisories/GHSA-mj4r-2hfc-f8p6

• Multiple vulnerabilities in Netty
• IBM Rational Performance Tester update for Netty
• Multiple vulnerabilities in IBM SPSS Analytic Server
• SUSE update for netty, netty-tcnative
• Multiple vulnerabilities in IBM Voice Gateway
• Multiple vulnerabilities in Bamboo Data Center
• Multiple vulnerabilities in Crowd Data Center
• Multiple vulnerabilities in Jira Service Management Data Center and Jira Service Management Server
• Multiple vulnerabilities in IBM Db2
• Multiple vulnerabilities in Confluence Data Center
• IBM Storage Protect Server update for Netty