CVSS 3.1
8.1 highCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:HCVE-2026-44249
High (8.1) in netty netty. EPSS 1.0% chance of exploitation in the next 30 days. Fixed in io.netty:netty-handler 4.1.135.Final, 4.2.15.Final.
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.
Severity
- EPSS
- 1.0% chance of exploitation in the next 30 days; higher than 62% of CVEs (scores of 2026-10-31)
- CWEs
- CWE-284, CWE-697, CWE-1287
- Published
- Modified
- Record from
- the NVD, synced
Affected
- netty:netty
Packages (OSV)
| Advisory | Ecosystem | Package | Affected | Fixed in |
|---|---|---|---|---|
| GHSA-3qp7-7mw8-wx86 | Maven | io.netty:netty-handler | >=4.2.0.Final <4.2.15.Final | 4.2.15.Final |
| GHSA-3qp7-7mw8-wx86 | Maven | io.netty:netty-handler | <4.1.135.Final | 4.1.135.Final |