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© 2026 FAUCET Technologies LLC. All rights reserved.

CVE-2026-44249

37
FAUCET Score

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.

First published: Jun 11, 2026Last modified: Jun 11, 2026

Impacted Technologies

VendorProductVersion(s)CPE
< 4.1.135CPE matchmatch criteria
cpe:2.3:a:netty:netty:*:*:*:*:*:*:*:*
>= 4.2.0, < 4.2.15CPE matchmatch criteria
cpe:2.3:a:netty:netty:*:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.1

8.1HIGH

CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H

Attack Vector
NETWORK
Attack Complexity
HIGH
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
HIGH
Availability Impact
HIGH
Exploitability Score
2.2
Impact Score
5.9
CvssVersion
3.1

Exploit Intelligence

EPSS Score
0.57%
Probability of exploitation in next 30 days
EPSS Percentile
43.9%
Percentile rank of EPSS score among Peer Group
As of 2026-07-27
Model: v2026.06.15
This CVE's current EPSS score of 0.0057 is in the 16th percentile among its peer group of 8,918 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.1 Reddit, 0.1 Bluesky, 0.1 Mastodon, and 0.2 GitHub mentions.

Media Mentions

No media coverage found for this CVE.

The average CVE in this peer group has 0.1 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Patch Available

Vendor Patches (3)

mavenpatch availablevia ghsa
Product: io.netty:netty-handlerFixed in: 4.2.15.Final
mavenpatch availablevia ghsa
Product: io.netty:netty-handlerFixed in: 4.1.135.Final
github_advisoryvendor investigatingvia nvd_reference
View patch

Vendor Advisories (1)

mavenGHSA-3qp7-7mw8-wx86high

Netty has an IPv6 Subnet Filter Bypass via Incorrect Comparator Masking

Jun 8, 2026

References

access.redhat.com / errata/RHSA-2026:26017
access.redhat.com / errata/RHSA-2026:26018
access.redhat.com / errata/RHSA-2026:26586
access.redhat.com / errata/RHSA-2026:28573
access.redhat.com / errata/RHSA-2026:34608
access.redhat.com / errata/RHSA-2026:36820
access.redhat.com / errata/RHSA-2026:37390
access.redhat.com / errata/RHSA-2026:41951
access.redhat.com / security/cve/CVE-2026-44249
bugzilla.redhat.com / show_bug.cgi
security.access.redhat.com / data/csaf/v2/vex/2026/cve-2026-44249.json
github.com / netty/netty/releases/tag/netty-4.1.135.Final
Release Notes
github.com / netty/netty/releases/tag/netty-4.2.15.Final
Release Notes
github.com / netty/netty/security/advisories/GHSA-3qp7-7mw8-wx86
Vendor Advisory