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

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 4.2.0.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。

CVSS 7.5 · High EPSS 0.41% · P34

Possible ATT&CK Techniques 1 AI

T1496 · Resource Hijacking

Affected Version Matrix 1

VendorProduct Version RangeStatus
netty netty >= 4.2.0.Final, < 4.2.13.Final affected
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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: CVE Program / CVE List V5
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: 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
对已超过有效生命周期的资源丧失索引
Source: CVE Program / CVE List V5
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

Vendor Product Affected Versions CPE Subscribe
netty netty >= 4.2.0.Final, < 4.2.13.Final -

II. Public POCs for CVE-2026-42577

# POC Description Source Link Shenlong Link
AI-Generated POC Premium
Qwen3.6-35B-A3B · 11720 chars
Pro+ exclusive includes:
Vulnerability reproduction recording (real sandbox build + trigger, exclusive)
In-depth vulnerability mechanism
Trigger conditions & impact
Full executable POC code
Exploit chain & mitigation
POC zip download
100+ AI POC generations per month

III. Intelligence Information for CVE-2026-42577

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Patches & Fixes for CVE-2026-42577 (2)

Vendor Advisories for CVE-2026-42577 (1)

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

CVE-2026-42587 7.5 HIGH Netty: HttpContentDecompressor maxAllocation bypass via Content-Encoding: br/zstd/snappy e
CVE-2026-42582 7.5 HIGH Netty: HTTP/3 QPACK literal unbounded allocation
CVE-2026-42579 7.5 HIGH Netty: DNS Codec Input Validation Bypass in Netty (Encoder + Decoder)
CVE-2026-42583 7.5 HIGH Netty: Lz4FrameDecoder resource exhaustion
CVE-2026-42584 7.3 HIGH Netty: HttpClientCodec response desynchronization
CVE-2026-42586 6.8 MEDIUM Netty: CRLF Injection in Netty Redis Codec Encoder
CVE-2026-42580 6.5 MEDIUM Netty: HTTP Request Smuggling due to incorrect chunk size parsing
CVE-2026-42585 6.5 MEDIUM Netty: HTTP Request Smuggling due to malformed Transfer-Encoding
CVE-2026-42581 5.8 MEDIUM Netty: HTTP/1.0 TE+CL Coexistence Bypasses Smuggling Sanitization
CVE-2026-44248 5.3 MEDIUM Netty: Resource exhaustion in MqttDecoder
CVE-2026-42578 2.9 LOW Netty: 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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