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Advisory record · GHSA-mfg7-5gfp-c4w3

Netty: Memory Leak in DNS Record Decoder via Malformed Domain Names

CVSS 5.3 MediumEPSS 0.0063 · 50th percentile

Published by the GitHub Advisory Database at 24 Jul 2026, 16:52 UTC. agentprime has not analysed this yet, so whether it affects any app is not known.

PackageEcosystemAffectedFixed in
io.netty:netty-codec-dnsMaven>=4.2.0.Final, <4.2.16.Final || <4.1.136.Final4.2.16.Final, 4.1.136.Final
Identifiers
GHSA-mfg7-5gfp-c4w3 · CVE-2026-73508
Weakness (CWE)
CWE-772
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 netty-codec-dns package is vulnerable in versions from 4.2.0.Final up to but not including 4.2.16.Final, and in versions before 4.1.136.Final. A remote attacker can send malicious DNS packets containing invalid domain names, which causes the decoder to leak direct memory on each packet, leading to gradual denial of service. Upgrade to 4.2.16.Final or 4.1.136.Final. The source gives no workaround.

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
5.3 Medium 3.1 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L CNA (GitHub_M)
  • CISA KEV Not listed.
  • EPSS 0.0063, the 50th 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.