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High severity7.5GHSA Advisory· Published May 13, 2026· Updated May 18, 2026

CVE-2026-42578

CVE-2026-42578

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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Affected packages

Versions sourced from the GitHub Security Advisory.

PackageAffected versionsPatched versions
io.netty:netty-handler-proxyMaven
< 4.1.133.Final4.1.133.Final
io.netty:netty-handler-proxyMaven
>= 4.2.0.Alpha1, < 4.2.13.Final4.2.13.Final

Affected products

200

Patches

Vulnerability mechanics

References

4

News mentions

0

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