CVE-2026-42583

7.5 HIGH

Netty is an asynchronous, event-driven network application framework

Published: 2026-05-13 · Last updated: 2026-05-18

Severity and scoring

CVSS: 7.5 HIGH
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
CWE: CWE-400, CWE-770

Affected products

Vendor	Product
netty	netty

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.

Source: NVD

References

[NVD]https://nvd.nist.gov/vuln/detail/CVE-2026-42583
[Vendor advisory]https://github.com/netty/netty/security/advisories/GHSA-mj4r-2hfc-f8p6
[Vendor advisory]https://github.com/netty/netty/security/advisories/GHSA-mj4r-2hfc-f8p6

Related CVEs

Same vendor

CVE-2026-50560 — Netty is a network application framework for development of protocol servers and clients (5.3 MEDIUM)
CVE-2026-50020 — Netty is a network application framework for development of protocol servers and clients (5.3 MEDIUM)
CVE-2026-50011 — Netty is a network application framework for development of protocol servers and clients (7.5 HIGH)
CVE-2026-50010 — Netty is a network application framework for development of protocol servers and clients (7.5 HIGH)
CVE-2026-50009 — Netty is a network application framework for development of protocol servers and clients (4.8 MEDIUM)

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