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CVE-2026-73507— Netty: Denial of Service in XmlFrameDecoder via CPU Exhaustion

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团队开源的一个高性能网络通信框架。 Netty 4.1.136.Final之前版本和4.2.16.Final之前版本存在资源管理错误漏洞，该漏洞源于io.netty.handler.codec.xml.XmlFrameDecoder.decode()方法未能在多次调用间保留结束标签解析器状态，可能导致未经身份验证的远程攻击者通过缓慢发送重复的</序列，反复扫描累积缓冲区并耗尽EventLoop线程CPU，造成拒绝服务。

CVSS 7.5 · High EPSS 0.79% · P55

Possible ATT&CK Techniques 1 AI

T1499 · Endpoint Denial of Service

Affected Version Matrix 2

VendorProduct Version RangeStatus
netty netty < 4.1.136.Final affected
>= 4.2.0.Final, < 4.2.16.Final affected
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I. Basic Information for CVE-2026-73507

Vulnerability Information
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Vulnerability Title
Netty: Denial of Service in XmlFrameDecoder via CPU Exhaustion
Source: CVE Program / CVE List V5
Vulnerability Description
Netty is an asynchronous, event-driven network application framework. Prior to 4.1.136.Final and 4.2.16.Final, io.netty.handler.codec.xml.XmlFrameDecoder.decode() failed to preserve closing-tag parser state across invocations, so an unauthenticated remote attacker could trickle-feed repeated </ sequences that repeatedly rescanned the accumulated buffer and exhausted an EventLoop thread's CPU, causing denial of service with a maxFrameLength of 1 MB. This issue is fixed in versions 4.1.136.Final and 4.2.16.Final.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
未加控制的资源消耗(资源穷尽)
Source: CVE Program / CVE List V5
Vulnerability Title
Netty 资源管理错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Netty是Netty团队开源的一个高性能网络通信框架。 Netty 4.1.136.Final之前版本和4.2.16.Final之前版本存在资源管理错误漏洞，该漏洞源于io.netty.handler.codec.xml.XmlFrameDecoder.decode()方法未能在多次调用间保留结束标签解析器状态，可能导致未经身份验证的远程攻击者通过缓慢发送重复的</序列，反复扫描累积缓冲区并耗尽EventLoop线程CPU，造成拒绝服务。
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 < 4.1.136.Final -

II. Public POCs for CVE-2026-73507

# POC Description Source Link Shenlong Link
AI-Generated POC Premium
Qwen3.6-35B-A3B · 12138 chars
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III. Intelligence Information for CVE-2026-73507

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Vendor Advisories for CVE-2026-73507 (1)

Vendor Pages for CVE-2026-73507 (2)

IV. Related Vulnerabilities

Same product: netty
Same vendor: netty
Same weakness: CWE-400

V. Comments for CVE-2026-73507

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