NetSight
IP …
high8.1

CVE-2026-44249

Netty is a network application framework for development of protocol servers and clients.

Impact

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

EcosystemPackageAffectedFixed in
mavenio.netty:netty-handler>= 4.2.0.Final, <= 4.2.14.Final4.2.15.Final

Affected products

VendorProductAffected versions
NettyNetty
before 4.1.135
from 4.2.0 before 4.2.15

Weakness classification

CWE-284CWE-697CWE-1287

References