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.
| Vendor | Product | Versions |
|---|---|---|
| netty | netty | >= 4.2.0.Final, < 4.2.15.Final, < 4.1.135.Final |
Downstream vendors/products affected by this vulnerability
| Vendor | Product | Source | Confidence |
|---|---|---|---|
| atlassian | crucible | cert_advisory | 90% |
| atlassian | bitbucket | cert_advisory | 90% |
| atlassian | jira | cert_advisory | 90% |
| atlassian | bamboo | cert_advisory | 90% |
| atlassian | fisheye | cert_advisory | 90% |
Updated severity to CRITICAL, changed exploit availability to false, and provided a new description with details about CVE-2026-44249.
Initial creation
