Recommended action

Update io.netty:netty-handler to 4.2.15.Final; io.netty:netty-handler to 4.1.135.Final if you use the affected versions. Test the change in a non-production environment first.

hol-guard supply-chain scan

What this means

Netty has an IPv6 Subnet Filter Bypass via Incorrect Comparator Masking affects io.netty:netty-handler (maven), io.netty:netty-handler (maven). Severity is high. ### Summary An attacker can bypass IPv6 subnet rules due to an incorrect masking operation in IpSubnetFilterRule.compareTo(). Valid public IP addresses can bypass the restrictions. ### Details `io.netty.handler.ipfilter.IpSubnetFilterRule#compareTo(java.net.InetSocketAddress)` method performs a bitwise AND between the incoming IP address and the configured networkAddress, instead of the subnetMask. ### Impact Access Control Bypass. Attacker can bypass IpSubnetFilter IPv6 access controls.

AI coding agents often install or upgrade packages automatically in maven. A high vulnerability in a dependency can be pulled into a project through a normal install or update without a human reviewing the change, expanding the blast radius from a single package to every agent workspace that depends on it.

Affected software

Recommended action

Update io.netty:netty-handler to 4.2.15.Final; io.netty:netty-handler to 4.1.135.Final if you use the affected versions. Test the change in a non-production environment first.

hol-guard supply-chain scan

What this means

Netty has an IPv6 Subnet Filter Bypass via Incorrect Comparator Masking affects io.netty:netty-handler (maven), io.netty:netty-handler (maven). Severity is high. ### Summary An attacker can bypass IPv6 subnet rules due to an incorrect masking operation in IpSubnetFilterRule.compareTo(). Valid public IP addresses can bypass the restrictions. ### Details `io.netty.handler.ipfilter.IpSubnetFilterRule#compareTo(java.net.InetSocketAddress)` method performs a bitwise AND between the incoming IP address and the configured networkAddress, instead of the subnetMask. ### Impact Access Control Bypass. Attacker can bypass IpSubnetFilter IPv6 access controls.

AI coding agents often install or upgrade packages automatically in maven. A high vulnerability in a dependency can be pulled into a project through a normal install or update without a human reviewing the change, expanding the blast radius from a single package to every agent workspace that depends on it.

Affected software