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Advisory record · GHSA-558v-64gr-wgg4

Netty: [Bzip2Decoder] Infinite Loop in RLE State Machine Leads to Event-Loop Thread Hang

CVSS 8.7 HighEPSS 0.0046 · 40th percentile

Published by the GitHub Advisory Database at 22 Jul 2026, 21:50 UTC. agentprime has not analysed this yet, so whether it affects any app is not known.

PackageEcosystemAffectedFixed in
io.netty:netty-codec-compressionMaven>=4.2.0.Final, <4.2.16.Final4.2.16.Final
io.netty:netty-codecMaven<4.1.136.Final4.1.136.Final
Identifiers
GHSA-558v-64gr-wgg4 · CVE-2026-59901
Weakness (CWE)
CWE-835
Tags
Published
22 Jul 2026
Updated
10 Sept 2026

Machine-written summary

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

netty-codec-compression versions 4.2.0.Final up to 4.2.16.Final and netty-codec versions before 4.1.136.Final contain an infinite loop in the Bzip2Decoder run-length decoding. An attacker who can send a malformed bzip2 stream to the decoder can hang the event-loop thread, causing a denial of service. Upgrade netty-codec-compression to 4.2.16.Final or netty-codec to 4.1.136.Final.

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
8.7 High 4.0 CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N CNA (GitHub_M)
  • CISA KEV Not listed.
  • EPSS 0.0046, the 40th percentile, on 6 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.

Timeline

  1. 31 Oct 2026, 14:17 UTC First seen by agentprime
  2. 31 Oct 2026, 14:17 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.