Netty: Lz4FrameDecoder resource exhaustion_CVE-2026-42583

7.5 / 10

HIGH

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

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.

Basic Information

ID CVE-2026-42583

Source GitHub_M

Published May 13, 2026 at 18:09

Affected Product

Vendor netty

Product netty

Version >= 4.2.0.Alpha1, < 4.2.13.Final

Affected Versions netty netty >= 4.2.0.Alpha1, < 4.2.13.Final
netty netty < 4.1.133.Final
io.netty netty-codec < 4.1.133.Final
io.netty netty-codec-compression < 4.2.13.Final

CWE Classification

CWE-400 CWE-770

References

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

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    "published": "2026-05-13T18:09:19.817Z",
    "modified": "2026-05-13T18:09:19.817Z",
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