CVE-2026-44249
Netty has an IPv6 Subnet Filter Bypass via Incorrect Comparator Masking
CVSS Score
8.1
EPSS Score
0.0%
EPSS Percentile
0th
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.
| CWE | CWE-284 CWE-697 |
| Vendor | netty |
| Product | netty |
| Published | Jun 11, 2026 |
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CVSS v3 Breakdown
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
High
Integrity
High
Availability
High
Affected Versions
netty / netty
>= 4.2.0.Final, < 4.2.15.Final < 4.1.135.Final