NuytsTech Security

CVE-2026-42583

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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.

More information : https://github.com/netty/netty/security/advisories/GHSA-mj4r-2hfc-f8p6

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