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Advisory severityHigh7.5Red Hat Linux

High [CVE-2026-59901] Infinite loop in netty-codec-compression (bzip2)

This high-severity Red Hat Linux advisory covers CVE-2026-59901 affecting Red Hat Data Grid 8.6.3, Streams for Apache Kafka 3.2.1, Red Hat OpenShift Dev Spaces 3.31.

Aggregated and source-linked by VulniPulse. Data sources, validation and limitations.

CVE-2026-59901 Source published Source updated

VulniPulse record published Record updated

CVE-2026-59901
Affected products & platforms
Red Hat LinuxUnclassified
Open source advisory

Summary

Netty is an asynchronous, event-driven network application framework. Prior to versions 4.1.136.Final and 4.2.16.Final, the `Bzip2Decoder` handler in Netty's compression codec pipeline is vulnerable to a denial-of-service attack through a malformed bzip2 stream that permanently captures the event-loop thread in an infinite loop.

The vulnerability exists in the run-length encoding (RLE) state machine within [`Bzip2BlockDecompressor.read()`]. This vulnerability, caused by a logic error in the bzip2 decoder, allows a remote attacker to send specially crafted bzip2-compressed data.

Processing this malformed data can trigger an infinite loop, causing the decoder thread to consume excessive CPU resources. This leads to a denial of service (DoS), requiring manual intervention to restore service.

Red Hat severity: Important — CVSS 7.5 (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H). Weakness: CWE-835.

Affected Red Hat products: Red Hat Data Grid 8.6.3; Streams for Apache Kafka 3.2.1; Red Hat OpenShift Dev Spaces 3.31; Red Hat build of Apache Camel - HawtIO 4. Red Hat lists Red Hat JBoss Enterprise Application Platform Expansion Pack; Red Hat OpenShift Dev Spaces as not affected.

Red Hat fixing advisory: RHSA-2026:69296, RHSA-2026:54435, RHSA-2026:90321.

Is CVE-2026-59901 exploited?

No exploitation is reported in the sources VulniPulse tracks: CVE-2026-59901 is not in the CISA KEV catalog (checked ) and this advisory does not report exploitation. That is not proof the vulnerability cannot be exploited.

How do I fix CVE-2026-59901?

Upgrade to a fixed release named by Red Hat:

  • 4.1.136
  • 4.2.16
  • netty-codec-compression
  • devspaces/multicluster-redirector-rhel9:1792491532
  • RHSA-2026:69296
  • RHSA-2026:54435
  • RHSA-2026:90321

Confirm against the vendor advisory before you patch.

Affected versions
  • < 4.1.136.Final
  • < 4.2.16.Final

Official advisory · high-confidence parse· fetched 3 days ago·verify at source

Fixed versions
  • 4.1.136
  • 4.2.16
  • netty-codec-compression
  • devspaces/multicluster-redirector-rhel9:1792491532
  • RHSA-2026:69296
  • RHSA-2026:54435
  • RHSA-2026:90321

Official advisory · high-confidence parse· fetched 3 days ago·verify at source

Mitigation

Upgrade to a fixed release: 4.1.136, 4.2.16, netty-codec-compression, devspaces/multicluster-redirector-rhel9:1792491532, RHSA-2026:69296, RHSA-2026:54435. That is the remediation for this advisory.

The vendor advisory may list interim mitigations or workarounds not captured here. Review it before change work.

Official advisory · high-confidence parse· fetched 3 days ago·verify at source

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