CVE WatchJul 15, 2026

CVE-2026-42578

Netty is an asynchronous, event-driven network application framework. Prior to 4.2.13.Final and 4.1.133.Final, Netty's HttpProxyHandler cons

CVSS

7.5

High

EPSS

1.0%

p57

KEV

—

Exploit Today

0-100

Published: May 13, 2026 · Last modified: Jul 15, 2026 · CWE-113 · CWE-93

EPSS · 30d

0.7%EPSS · 30 days1.0%

2026-06-302026-07-16

Technical 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.

Official references

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