Netty prior 4.1.135.Final/4.2.15.Final IpSubnetFilterRule.compareTo access control

CVSS Meta Temp Score
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Current Exploit Price (≈)
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CTI Interest Score
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6.7$0-$5k3.38

Summaryinfo

A vulnerability labeled as critical has been found in Netty. Affected is the function IpSubnetFilterRule.compareTo. Executing a manipulation can lead to access control. The identification of this vulnerability is CVE-2026-44249. The attack may be launched remotely. There is no exploit available. The affected component should be upgraded.

Detailsinfo

A vulnerability has been found in Netty and classified as critical. This vulnerability affects the function IpSubnetFilterRule.compareTo. The manipulation with an unknown input leads to a access control vulnerability. The CWE definition for the vulnerability is CWE-284. The product does not restrict or incorrectly restricts access to a resource from an unauthorized actor. As an impact it is known to affect confidentiality, integrity, and availability. CVE summarizes:

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.

The advisory is available at github.com. This vulnerability was named CVE-2026-44249 since 05/05/2026. The exploitation appears to be difficult. The attack can be initiated remotely. No form of authentication is required for a successful exploitation. Technical details are known, but there is no available exploit. This vulnerability is assigned to T1068 by the MITRE ATT&CK project.

Upgrading to version 4.1.135.Final or 4.2.15.Final eliminates this vulnerability. The upgrade is hosted for download at github.com.

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Productinfo

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Website

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔒
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 6.8
VulDB Meta Temp Score: 6.7

VulDB Base Score: 5.6
VulDB Temp Score: 5.4
VulDB Vector: 🔒
VulDB Reliability: 🔍

CNA Base Score: 8.1
CNA Vector (GitHub_M): 🔒

CVSSv2info

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VulDB Base Score: 🔒
VulDB Temp Score: 🔒
VulDB Reliability: 🔍

Exploitinginfo

Class: Access control
CWE: CWE-284 / CWE-266
CAPEC: 🔒
ATT&CK: 🔒

Physical: No
Local: No
Remote: Yes

Availability: 🔒
Status: Not defined
Price Prediction: 🔍
Current Price Estimation: 🔒

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Threat Intelligenceinfo

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔒

Upgrade: Netty 4.1.135.Final/4.2.15.Final

Timelineinfo

05/05/2026 CVE reserved
06/12/2026 +38 days Advisory disclosed
06/12/2026 +0 days VulDB entry created
06/12/2026 +0 days VulDB entry last update

Sourcesinfo

Product: github.com

Advisory: GHSA-3qp7-7mw8-wx86
Status: Confirmed

CVE: CVE-2026-44249 (🔒)
GCVE (CVE): GCVE-0-2026-44249
GCVE (VulDB): GCVE-100-370534

Entryinfo

Created: 06/12/2026 06:29
Changes: 06/12/2026 06:29 (64)
Complete: 🔍
Cache ID: 216::103

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