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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.
Priority
LOW
Exploitation
NONE
PoC
YES
Patch
NONE
Momentum
NONE
If you run products in this scope, you should treat this CVE as relevant to your environment.
CVE-2026-42578 HTTP Header Injection in Netty HttpProxyHandler Versions Before http://4.2.13.Final https://vulmon.com/vulnerabilitydetails?qid=CVE-2026-42578
Post summary
The text references CVE-2026-42578, describing an HTTP Header Injection vulnerability in Netty HttpProxyHandler versions before 4.2.13.Final, and links to a vulnerability details page.
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| Part | Vendor | Product | Version | Target SW | Target HW |
|---|---|---|---|---|---|
| App | netty | netty | - | - | - |