# CVE-2026-44249

## Summary

- **CVE ID:** CVE-2026-44249
- **Severity:** HIGH
- **CVSS Score:** 8.1 (CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H)
- **CWE:** CWE-284, CWE-697
- **Published:** Jun 11, 2026
- **Last Modified:** Sep 9, 2026

## Description

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.

## Affected Products

- netty — netty (>= 4.2.0.Final, < 4.2.15.Final)
- netty — netty (< 4.1.135.Final)

## References

- [CNA](https://github.com/netty/netty/security/advisories/GHSA-3qp7-7mw8-wx86)
- [CNA](https://github.com/netty/netty/releases/tag/netty-4.1.135.Final)
- [CNA](https://github.com/netty/netty/releases/tag/netty-4.2.15.Final)
- [redhat-SADP](https://access.redhat.com/security/cve/CVE-2026-44249)
- [redhat-SADP](https://bugzilla.redhat.com/show_bug.cgi?id=2488081)
- [redhat-SADP](https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-44249.json)
- [redhat-SADP](https://access.redhat.com/errata/RHSA-2026:26586)
- [redhat-SADP](https://access.redhat.com/errata/RHSA-2026:28573)
- [redhat-SADP](https://access.redhat.com/errata/RHSA-2026:26018)
- [redhat-SADP](https://access.redhat.com/errata/RHSA-2026:26017)
- [redhat-SADP](https://access.redhat.com/errata/RHSA-2026:34608)
- [redhat-SADP](https://access.redhat.com/errata/RHSA-2026:36820)
- [redhat-SADP](https://access.redhat.com/errata/RHSA-2026:37390)
- [redhat-SADP](https://access.redhat.com/errata/RHSA-2026:41951)
- [redhat-SADP](https://access.redhat.com/errata/RHSA-2026:48151)
- [redhat-SADP](https://access.redhat.com/errata/RHSA-2026:48124)
- [redhat-SADP](https://access.redhat.com/errata/RHSA-2026:49700)
- [redhat-SADP](https://access.redhat.com/errata/RHSA-2026:49701)
- [redhat-SADP](https://access.redhat.com/errata/RHSA-2026:53644)
- [redhat-SADP](https://access.redhat.com/errata/RHSA-2026:53806)
- [redhat-SADP](https://access.redhat.com/errata/RHSA-2026:54435)
- [redhat-SADP](https://access.redhat.com/errata/RHSA-2026:50085)
- [redhat-SADP](https://access.redhat.com/errata/RHSA-2026:65126)

## Exploitation Prediction (EPSS)

- **EPSS Score:** 1.03%
- **EPSS Percentile:** 61.5

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_Exported from OnDuty AI Vulnerability Intelligence on 2026-09-10._