CVE-2026-44249
Published:June 11, 2026
Updated:June 11, 2026
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.
Affected Packages
https://github.com/netty/netty.git (GITHUB):
Affected version(s) >=netty-4.2.0.Final <netty-4.2.15.FinalFix Suggestion:
Update to version netty-4.2.15.Finalhttps://github.com/netty/netty.git (GITHUB):
Affected version(s) >=netty-4.0.0.Alpha1 <netty-4.1.135.FinalFix Suggestion:
Update to version netty-4.1.135.Finalio.netty:netty-handler (JAVA):
Affected version(s) >=4.2.0.Final <4.2.15.FinalFix Suggestion:
Update to version 4.2.15.Finalio.netty:netty-handler (JAVA):
Affected version(s) >=4.0.0.Alpha1 <4.1.135.FinalFix Suggestion:
Update to version 4.1.135.FinalRelated Resources (4)
Do you need more information?
Contact UsCVSS v4
Base Score:
9.2
Attack Vector
NETWORK
Attack Complexity
HIGH
Attack Requirements
NONE
Privileges Required
NONE
User Interaction
NONE
Vulnerable System Confidentiality
HIGH
Vulnerable System Integrity
HIGH
Vulnerable System Availability
HIGH
Subsequent System Confidentiality
NONE
Subsequent System Integrity
NONE
Subsequent System Availability
NONE
CVSS v3
Base Score:
8.1
Attack Vector
NETWORK
Attack Complexity
HIGH
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
HIGH
Integrity
HIGH
Availability
HIGH