Infinite loop in Netty - CVE-2026-59901

Vulnerability identifier: #VU137563

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-2026-59901

CWE-ID: CWE-835

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 state management in Bzip2BlockDecompressor.read() when parsing a malformed bzip2 stream. A remote attacker can send a specially crafted compressed stream to cause a denial of service.

The issue can permanently capture the event-loop thread in an infinite loop.

Netty
SUSE Linux Enterprise Server 15 SP4
SUSE Linux Enterprise Server 15 SP5
SUSE Linux Enterprise Server 15 SP6
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 Server for SAP Applications 15
SUSE Linux Enterprise Real Time 15
SUSE Linux Enterprise Desktop 15
SUSE Package Hub 15
Development Tools Module
Crowd Data Center
Confluence Data Center
Jira Software Data Center
Jira Service Management Data Center
Bamboo Data Center
IBM Watson Discovery for IBM Cloud Pak for Data
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
Crowd Data Center - update to 7.2.2
Confluence Data Center - addressed in versions 9.2.24, 10.2.17
Jira Software Data Center - addressed in versions 9.12.38, 10.3.24, 11.3.9
Jira Service Management Data Center - addressed in versions 10.3.24, 11.3.10
Bamboo Data Center - addressed in versions 10.2.22, 12.1.10
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
IBM Watson Discovery for IBM Cloud Pak for Data - update to 5.4.2

• https://github.com/netty/netty/security/advisories/GHSA-558v-64gr-wgg4

• Multiple vulnerabilities in Netty
• SUSE update for netty, netty-tcnative
• Multiple vulnerabilities in Bamboo Data Center
• Multiple vulnerabilities in Crowd Data Center
• Multiple vulnerabilities in Jira Service Management Data Center
• Multiple vulnerabilities in Jira Software Data Center
• Multiple vulnerabilities in Confluence Data Center
• IBM Watson Discovery Cartridge update for Netty