CVE-2026-44249highCWE-1287 CWE-284 CWE-697

Netty has an IPv6 Subnet Filter Bypass via Incorrect Comparator Masking

21Vexday Risk Score

No sign of exploitation. No public exploitation artifact known so far.

ssvc Trackcvss 8.1epss 1.0%

exploitation probability

1.0%top 40% of all CVEs

observed exploitation

nono source reports it

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.

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

Affected products

netty · netty

References