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Advisory record · GHSA-676x-f7gg-47vc

Netty Vulnerable to DNS Cache Poisoning via Missing Bailiwick Checks in CNAME Records

CVSS 8.7 HighEPSS 0.0029 · 21st 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-676x-f7gg-47vc · CVE-2026-45674
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 before 4.2.15.Final and versions before 4.1.135.Final, does not check whether CNAME records in DNS responses are within the bailiwick of the query, so it caches them without validation. An attacker able to send spoofed DNS responses to the resolver could poison its cache and redirect name lookups. The source gives few details on the exact conditions required. Upgrade to 4.2.15.Final or 4.1.135.Final, or later.

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 0.0029, the 21st percentile, on 9 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.