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Advisory record · GHSA-mj4r-2hfc-f8p6

Netty Lz4FrameDecoder is vulnerable to resource exhaustion

CVSS 7.5 HighEPSS 0.0046 · 40th percentile

Published by the GitHub Advisory Database at 7 May 2026, 00:20 UTC. agentprime has not analysed this yet, so whether it affects any app is not known.

PackageEcosystemAffectedFixed in
io.netty:netty-codec-compressionMaven<4.2.13.Final4.2.13.Final
io.netty:netty-codecMaven<4.1.133.Final4.1.133.Final
Identifiers
GHSA-mj4r-2hfc-f8p6 · CVE-2026-42583
Weakness (CWE)
CWE-400 · CWE-770
Tags
Published
7 May 2026
Updated
10 Sept 2026

Machine-written summary

Summary written by Claude Haiku from the source advisory. Not reviewed by a person.

Netty's netty-codec-compression package, versions before 4.2.13.Final, and netty-codec, versions before 4.1.133.Final, are affected by a resource exhaustion flaw in the Lz4FrameDecoder. A remote peer that sends a small crafted LZ4 frame, around 22 bytes, can force the decoder to allocate up to 32 MB of memory before decompression runs, so many such requests can exhaust memory. Upgrade netty-codec-compression to 4.2.13.Final and netty-codec to 4.1.133.Final. The source gives few details on limits that could mitigate this.

Written 2 Nov 2026.

Not analysed yet

We haven’t published our analysis of this Advisory yet. Once a person has reviewed it, this page will say what’s vulnerable, what has to be true for your app to be affected, and how to check.

Severity and exploitation

ScoreRatingCVSSVectorSource
7.5 High 3.1 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H CNA (GitHub_M)
  • CISA KEV Not listed.
  • EPSS 0.0046, the 40th percentile, on 10 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.

Timeline

  1. 31 Oct 2026, 14:16 UTC First seen by agentprime
  2. 31 Oct 2026, 14:16 UTC Confirmed by OSV

Sources

Facts on this page come from the GitHub Advisory Database (CC-BY 4.0), OSV and the other sources listed, as published. We don’t reproduce full advisory descriptions, which can contain exploit code.