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Advisory record · GHSA-3qp7-7mw8-wx86

Netty has an IPv6 Subnet Filter Bypass via Incorrect Comparator Masking

CVSS 8.1 HighEPSS 0.0099 · 62nd percentile

Published by the GitHub Advisory Database at 8 Jun 2026, 19:00 UTC. agentprime has not analysed this yet, so whether it affects any app is not known.

PackageEcosystemAffectedFixed in
io.netty:netty-handlerMaven>=4.2.0.Final, <4.2.15.Final || <4.1.135.Final4.2.15.Final, 4.1.135.Final
Identifiers
GHSA-3qp7-7mw8-wx86 · CVE-2026-44249
Weakness (CWE)
CWE-284 · CWE-697 · CWE-1287
Tags
Published
8 Jun 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-handler package, versions 4.2.0.Final before 4.2.15.Final and versions before 4.1.135.Final, is affected. A flaw in the IPv6 subnet filter rule comparison (IpSubnetFilterRule.compareTo) uses the wrong operand in a bitwise AND, so an attacker can send traffic from addresses outside the configured subnet and bypass IPv6 access controls. 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
8.1 High 3.1 CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H CNA (GitHub_M)
  • CISA KEV Not listed.
  • EPSS 0.0099, the 62nd percentile, on 5 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.