Netty has an IPv6 Subnet Filter Bypass via Incorrect Comparator Masking
GHSA-3qp7-7mw8-wx86 · CVE-2026-44249
Published · Modified
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Description
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.
References
- WEB https://github.com/netty/netty/security/advisories/GHSA-3qp7-7mw8-wx86
- ADVISORY https://nvd.nist.gov/vuln/detail/CVE-2026-44249
- PACKAGE https://github.com/netty/netty
- WEB https://github.com/netty/netty/releases/tag/netty-4.1.135.Final
- WEB https://github.com/netty/netty/releases/tag/netty-4.2.15.Final
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