CVE-2026-44249
HIGHNetty has an IPv6 Subnet Filter Bypass via Incorrect Comparator Masking
Title source: cnaDescription
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.
References (3)
Core 3
Core References
X_Refsource_Confirm x_refsource_confirm
https://github.com/netty/netty/security/advisories/GHSA-3qp7-7mw8-wx86
X_Refsource_Misc x_refsource_misc
https://github.com/netty/netty/releases/tag/netty-4.1.135.Final
X_Refsource_Misc x_refsource_misc
https://github.com/netty/netty/releases/tag/netty-4.2.15.Final
Scores
CVSS v3
8.1
EPSS
0.0051
EPSS Percentile
39.4%
Attack Vector
NETWORK
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
CISA SSVC
Vulnrichment
Exploitation
none
Automatable
no
Technical Impact
total
Details
CWE
CWE-284
CWE-697
Status
published
Products (5)
io.netty/netty-handler
0 - 4.1.135.FinalMaven
io.netty/netty-handler
4.2.0.Final - 4.2.15.FinalMaven
netty/netty
< 4.1.135
netty/netty
< 4.1.135.Final
netty/netty
>= 4.2.0.Final, < 4.2.15.Final
Published
Jun 11, 2026
Tracked Since
Jun 12, 2026