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High severity7.5GHSA Advisory· Published May 13, 2026· Updated May 18, 2026

CVE-2026-42583

CVE-2026-42583

Description

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.

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Affected packages

Versions sourced from the GitHub Security Advisory.

PackageAffected versionsPatched versions
io.netty:netty-codec-compressionMaven
< 4.2.13.Final4.2.13.Final
io.netty:netty-codecMaven
< 4.1.133.Final4.1.133.Final

Affected products

280

Patches

Vulnerability mechanics

References

3

News mentions

0

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