GHSA-3qp7-7mw8-wx86
Netty has an IPv6 Subnet Filter Bypass via Incorrect Comparator Masking
At a glance
- Published
- Updated
- CVE
- CVE-2026-44249
- CVSS_V3
- CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
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.
Affected packages
| Package | Versions |
|---|---|
| Maven · io.netty:netty-handler | introduced 4.2.0.Final, fixed 4.2.15.Final |
| Maven · io.netty:netty-handler | introduced 0, fixed 4.1.135.Final |
References
- https://github.com/netty/netty/security/advisories/GHSA-3qp7-7mw8-wx86 WEB
- https://nvd.nist.gov/vuln/detail/CVE-2026-44249 ADVISORY
- https://github.com/netty/netty PACKAGE
- 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 WEB
Sources
| Source | Licence |
|---|---|
| OSV.dev | CC-BY 4.0 — GitHub Advisory Database |