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CVE-2026-44249— Netty has an IPv6 Subnet Filter Bypass via Incorrect Comparator Masking

Quick assessment

Affected
netty netty
Exploitation
Public or AI PoC available; prioritize validation
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Netty是Netty社区的一款非阻塞I/O客户端-服务器框架，它主要用于开发Java网络应用程序，如协议服务器和客户端等。 Netty 4.1.135.Final之前版本和4.2.15.Final之前版本存在访问控制错误漏洞，该漏洞源于IpSubnetFilterRule.compareTo()中掩码操作不正确，可能导致攻击者绕过IPv6子网规则。

CVSS 8.1 · High EPSS 1.29% · P69

Possible ATT&CK Techniques 1 AI

T1562.001

Affected Version Matrix 2

VendorProduct Version RangeStatus
netty netty >= 4.2.0.Final, < 4.2.15.Final affected
< 4.1.135.Final affected
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I. Basic Information for CVE-2026-44249

Vulnerability Information
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Vulnerability Title
Netty has an IPv6 Subnet Filter Bypass via Incorrect Comparator Masking
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
访问控制不恰当
Source: CVE Program / CVE List V5
Vulnerability Title
Netty 访问控制错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Netty是Netty社区的一款非阻塞I/O客户端-服务器框架，它主要用于开发Java网络应用程序，如协议服务器和客户端等。 Netty 4.1.135.Final之前版本和4.2.15.Final之前版本存在访问控制错误漏洞，该漏洞源于IpSubnetFilterRule.compareTo()中掩码操作不正确，可能导致攻击者绕过IPv6子网规则。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
netty netty >= 4.2.0.Final, < 4.2.15.Final -

II. Public POCs for CVE-2026-44249

# POC Description Source Link Shenlong Link
AI-Generated POC Premium
Qwen3.6-35B-A3B · 12929 chars
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In-depth vulnerability mechanism
Trigger conditions & impact
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POC zip download
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III. Intelligence Information for CVE-2026-44249

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Vendor Advisories for CVE-2026-44249 (1)

Vendor Pages for CVE-2026-44249 (2)

Same Patch Batch · netty · 2026-06-11 · 3 CVEs total

CVE-2026-44250 7.5 HIGH Netty: Memory Exhaustion in RedisArrayAggregator due to Deeply Nested Arrays
CVE-2026-44890 7.5 HIGH Netty has Unbounded Direct Memory Consumption in its RedisDecoder

IV. Related Vulnerabilities

Same product: netty
Same vendor: netty
Same weakness: CWE-284

V. Comments for CVE-2026-44249

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