Bug 2477219 (CVE-2026-42583) - CVE-2026-42583 netty: io.netty/netty-codec-compression: io.netty/netty-codec: Netty: Denial of Service via excessive memory allocation in LZ4FrameDecoder
Summary: CVE-2026-42583 netty: io.netty/netty-codec-compression: io.netty/netty-codec:...
Keywords:
Status: NEW
Alias: CVE-2026-42583
Product: Security Response
Classification: Other
Component: vulnerability
Version: unspecified
Hardware: All
OS: Linux
high
high
Target Milestone: ---
Assignee: Product Security DevOps Team
QA Contact:
URL:
Whiteboard:
Depends On: 2482695
Blocks:
TreeView+ depends on / blocked
 
Reported: 2026-05-13 19:01 UTC by OSIDB Bzimport
Modified: 2026-07-03 09:15 UTC (History)
112 users (show)

Fixed In Version:
Clone Of:
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Last Closed:
Embargoed:

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System ID Private Priority Status Summary Last Updated
Red Hat Product Errata RHSA-2026:34608 0 None None None 2026-07-02 00:04:51 UTC

Description OSIDB Bzimport 2026-05-13 19:01:54 UTC 
Netty is an asynchronous, event-driven network application framework. Prior to 4.2.13.Final and 4.1.133.Final, Lz4FrameDecoder allocates a ByteBuf of size decompressedLength (up to 32 MB per block) before LZ4 runs. A peer only needs a 21-byte header plus compressedLength payload bytes - 22 bytes if compressedLength == 1 - to force that allocation. This vulnerability is fixed in 4.2.13.Final and 4.1.133.Final.
Comment 4 errata-xmlrpc 2026-07-02 00:04:45 UTC 
This issue has been addressed in the following products:

  Streams for Apache Kafka 2.9.4

Via RHSA-2026:34608 https://access.redhat.com/errata/RHSA-2026:34608
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