High severity7.5GHSA Advisory· Published May 13, 2026· Updated May 14, 2026

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.

Affected products

Netty/NettyGHSA
Range: <= 4.1.132.Final

Patches

No patches discovered yet.

Vulnerability mechanics

AI mechanics synthesis has not run for this CVE yet.

References

github.com/advisories/GHSA-mj4r-2hfc-f8p6ghsaADVISORY
github.com/netty/netty/security/advisories/GHSA-mj4r-2hfc-f8p6nvd
nvd.nist.gov/vuln/detail/CVE-2026-42583ghsa

News mentions

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