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CVE-2026-42577— Netty: epoll transport denial of service via RST on half-closed TCP connection

CVSS 7.5 · High EPSS 0.04% · P11
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I. Basic Information for CVE-2026-42577

Vulnerability Information
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Vulnerability Title
Netty: epoll transport denial of service via RST on half-closed TCP connection
Source: NVD (National Vulnerability Database)
Vulnerability Description
Netty is an asynchronous, event-driven network application framework. From 4.2.0.Final to 4.2.13.Final , Netty's epoll transport fails to detect and close TCP connections that receive a RST after being half-closed, leading to stale channels that are never cleaned up and, in some code paths, a 100% CPU busy-loop in the event loop thread. This vulnerability is fixed in 4.2.13.Final.
Source: NVD (National Vulnerability Database)
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Source: NVD (National Vulnerability Database)
Vulnerability Type
对已超过有效生命周期的资源丧失索引
Source: NVD (National Vulnerability Database)
Vulnerability Title
Netty 安全漏洞
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 4.2.0.Final版本至4.2.13.Final版本存在安全漏洞，该漏洞源于epoll传输无法检测和关闭半关闭后接收RST的TCP连接，可能导致陈旧通道和事件循环线程CPU繁忙循环。
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

VendorProductAffected VersionsCPESubscribe
nettynetty >= 4.2.0.Final, < 4.2.13.Final -

II. Public POCs for CVE-2026-42577

#POC DescriptionSource LinkShenlong Link
AI-Generated POCPremium
Qwen3.6-35B-A3B · 11676 chars
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III. Intelligence Information for CVE-2026-42577

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Same Patch Batch · netty · 2026-05-13 · 12 CVEs total

CVE-2026-425877.5 HIGHNetty: HttpContentDecompressor maxAllocation bypass via Content-Encoding: br/zstd/snappy e
CVE-2026-425827.5 HIGHNetty: HTTP/3 QPACK literal unbounded allocation
CVE-2026-425797.5 HIGHNetty: DNS Codec Input Validation Bypass in Netty (Encoder + Decoder)
CVE-2026-425837.5 HIGHNetty: Lz4FrameDecoder resource exhaustion
CVE-2026-425847.3 HIGHNetty: HttpClientCodec response desynchronization
CVE-2026-425866.8 MEDIUMNetty: CRLF Injection in Netty Redis Codec Encoder
CVE-2026-425806.5 MEDIUMNetty: HTTP Request Smuggling due to incorrect chunk size parsing
CVE-2026-425856.5 MEDIUMNetty: HTTP Request Smuggling due to malformed Transfer-Encoding
CVE-2026-425815.8 MEDIUMNetty: HTTP/1.0 TE+CL Coexistence Bypasses Smuggling Sanitization
CVE-2026-442485.3 MEDIUMNetty: Resource exhaustion in MqttDecoder
CVE-2026-42578Netty: HTTP Header Injection via HttpProxyHandler Disabled Validation

IV. Related Vulnerabilities

Same product: netty
Same vendor: netty
Same weakness: CWE-772

V. Comments for CVE-2026-42577

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