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.

CVSS Vector

References

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