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.

PUBLISHED Reserved 2026-04-28 | Published 2026-05-13 | Updated 2026-05-14 | Assigner GitHub_M

Problem types

CWE-400: Uncontrolled Resource Consumption

CWE-770: Allocation of Resources Without Limits or Throttling

Product status

References

github.com/.../netty/security/advisories/GHSA-mj4r-2hfc-f8p6 exploit

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

cve.org (CVE-2026-42583)

nvd.nist.gov (CVE-2026-42583)

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