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CVE-2026-42578

HIGH · CVSS 7.5 EPSS 0.01% Public Exploit

Source: NVD + CISA KEV + EPSS · Published: 2026-05-13 · Last synced: 2026-06-09

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Public Exploit Signal

A public exploit, PoC, GitHub repository or Metasploit reference was detected for this CVE.

GitHub PoC Links

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CVE
CVE-2026-42578
Severity
HIGH
CVSS
7.5
EPSS
0.01%

Original NVD 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.