Security Advisory

CVE-2026-42578

CVE vulnerability detail - eXtreme Datacenter Security Operations

Published 2026-05-13 17:57:43

Last updated 2026-07-21 12:05:03

Assigner GitHub_M

CVSS score 2.9

State PUBLISHED

Description

Netty is an asynchronous, event-driven network application framework. Prior to 4.2.13.Final and 4.1.133.Final, Netty's HttpProxyHandler constructs HTTP CONNECT requests with header validation explicitly disabled. The newInitialMessage() method creates headers using DefaultHttpHeadersFactory.headersFactory().withValidation(false), then adds user-provided outboundHeaders without any CRLF validation. This allows an attacker who can influence the outbound headers to inject arbitrary HTTP headers into the CONNECT request sent to the proxy server. This vulnerability is fixed in 4.2.13.Final and 4.1.133.Final.

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