High 8.1Published Jun 11, 2026

CVE-2026-44249Netty has an IPv6 Subnet Filter Bypass via Incorrect Comparator Masking

Updated under an hour ago (Oct 26, 2026, 9:50 PM ET)

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It affects netty and 25 other products. Add what you run to find out whether that includes you.

No exploitation reported and no EPSS estimate yet.

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Every CVE for netty

Exploited in the last 30 days

Netty is a network application framework for development of protocol servers and clients. In netty-handler prior to versions 4.1.135.Final and 4.2.15.Final, an attacker can bypass IPv6 subnet rules due to an incorrect masking operation in IpSubnetFilterRule.compareTo(). Valid public IP addresses can bypass the restrictions. Versions 4.1.135.Final and 4.2.15.Final patch the issue.

CVSS: 8.1 HIGH (v3.1, CNA)CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
Weakness (CWE): CWE-284, CWE-697, CWE-1287
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): Not loaded for this CVE
Assigned by: GitHub_M
NVD analysis: Modified
Record last updated: Sep 18, 2026
First seen by InfoSec Signals: Oct 9, 2026

Affected products

Affected products

netty netty netty:netty (from the name)	from 4.2.0.Final, < 4.2.15.Final; before 4.1.135.Final	CNA record
Red Hat Cryostat 4 on RHEL 9 redhat:cryostat	from 4.2.0-13 not affected	CISA ADP
Red Hat Red Hat AMQ Broker 7.13.6 redhat:amq_broker	7.13	CISA ADP
Red Hat Red Hat Build of Apache Camel 3.33 for Quarkus 3.33.2.SP1 redhat:apache_camel_quarkus	3.33	CISA ADP
Red Hat Red Hat build of Apache Camel 4.18.1.P1 for Spring Boot 3.5.16 redhat:apache_camel_spring_boot	4.18	CISA ADP
Red Hat Red Hat build of Quarkus 3.27.4.SP1 redhat:quarkus	3.27	CISA ADP
Red Hat Red Hat Data Grid 8.6.2 redhat:jboss_data_grid	8	CISA ADP
Red Hat Red Hat JBoss Enterprise Application Platform 7.4 ELS on RHEL 7 redhat:jboss_enterprise_application_platform_els	from 0:2.16.0-22.redhat_00057.1.el7eap not affected	CISA ADP
Red Hat Red Hat JBoss Enterprise Application Platform 8.1 redhat:jboss_enterprise_application_platform_xp	6.0	CISA ADP
Red Hat Red Hat JBoss Enterprise Application Platform 8.1.7.GA redhat:jboss_enterprise_application_platform	from 4.1.135.Final-redhat-00001 not affected	CISA ADP
1–10 of 27

References

References

https://github.com/netty/netty/security/advisories/GHSA-3qp7-7mw8-wx86	x-refsource-confirm, vendor-advisory
https://github.com/netty/netty/releases/tag/netty-4.1.135.Final	x-refsource-misc, release-notes
https://github.com/netty/netty/releases/tag/netty-4.2.15.Final	x-refsource-misc, release-notes
https://access.redhat.com/errata/RHSA-2026:26017
https://access.redhat.com/errata/RHSA-2026:26018
https://access.redhat.com/errata/RHSA-2026:26586
https://access.redhat.com/errata/RHSA-2026:28573
https://access.redhat.com/errata/RHSA-2026:34608
https://access.redhat.com/errata/RHSA-2026:36820
https://access.redhat.com/errata/RHSA-2026:37390
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The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.