High [CVE-2026-59901] Infinite loop in netty-codec-compression (bzip2)
This high-severity Red Hat Linux advisory covers CVE-2026-59901 affecting Streams for Apache Kafka 3.2.1, Red Hat build of Apache Camel - HawtIO 4, Red Hat Data Grid 8.
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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: Streams for Apache Kafka 3.2.1; Red Hat build of Apache Camel - HawtIO 4; Red Hat Data Grid 8; Red Hat OpenShift Dev Spaces. Red Hat lists Red Hat JBoss Enterprise Application Platform Expansion Pack; Red Hat OpenShift Dev Spaces as not affected.
Red Hat fixing advisory: RHSA-2026:54435.
- < 4.1.136.Final
- < 4.2.16.Final
Official advisory · high-confidence parse· fetched 13 days ago·verify at source
- 4.1.136
- 4.2.16
- netty-codec-compression
- RHSA-2026:54435
Official advisory · high-confidence parse· fetched 13 days ago·verify at source
Mitigation
Upgrade to a fixed release: 4.1.136, 4.2.16, netty-codec-compression, RHSA-2026:54435. That is the remediation for this advisory.
The vendor advisory may list additional interim mitigations or workarounds not captured here — review it before change work.
Official advisory · high-confidence parse· fetched 13 days ago·verify at source
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