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Advisory record · GHSA-v74w-7mr3-4qg3

Netty: Denial of Service in XmlFrameDecoder via CPU Exhaustion

CVSS 7.5 HighEPSS 0.0079 · 56th percentile

Published by the GitHub Advisory Database at 24 Jul 2026, 16:53 UTC. agentprime has not analysed this yet, so whether it affects any app is not known.

PackageEcosystemAffectedFixed in
io.netty:netty-codec-xmlMaven>=4.2.0.Final, <4.2.16.Final || <4.1.136.Final4.2.16.Final, 4.1.136.Final
Identifiers
GHSA-v74w-7mr3-4qg3 · CVE-2026-73507
Weakness (CWE)
CWE-400
Tags
Published
24 Jul 2026
Updated
10 Sept 2026

Machine-written summary

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

Netty's io.netty:netty-codec-xml package, versions from 4.2.0.Final before 4.2.16.Final and from 4.1.0.Final before 4.1.136.Final, is affected. An unauthenticated remote attacker who can reach a server using XmlFrameDecoder can send a crafted XML stream of repeated closing-tag characters, which makes the decoder rescan its buffer repeatedly and can hang the event loop thread through CPU exhaustion. Upgrade to 4.2.16.Final or 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
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 0.0079, the 56th percentile, on 7 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.