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Advisory record · GHSA-5pvg-856g-cp85

Netty has Insufficient Bailiwick Validation for NS Records

CVSS 8.7 HighEPSS 0.0037 · 31st percentile

Published by the GitHub Advisory Database at 8 Jun 2026, 23:02 UTC. agentprime has not analysed this yet, so whether it affects any app is not known.

PackageEcosystemAffectedFixed in
io.netty:netty-resolver-dnsMaven>=4.2.0.Final, <4.2.15.Final || <4.1.135.Final4.2.15.Final, 4.1.135.Final
Identifiers
GHSA-5pvg-856g-cp85 · CVE-2026-47691
Weakness (CWE)
CWE-345 · CWE-346
Tags
Published
8 Jun 2026
Updated
18 Sept 2026

Machine-written summary

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

Netty's netty-resolver-dns package, versions 4.2.0.Final up to but not including 4.2.15.Final and versions before 4.1.135.Final, does not properly validate the bailiwick of NS records in DNS responses. An attacker who controls an authoritative name server for a subdomain can poison the resolver's cache for parent domains, affecting later lookups under them. Upgrade to 4.2.15.Final or 4.1.135.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 3.1 CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:N CNA (GitHub_M)
  • CISA KEV Not listed.
  • EPSS 0.0037, the 31st 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.