Bug 2477226 (CVE-2026-42578) - CVE-2026-42578 netty: io.netty/netty-handler-proxy: Netty: HTTP Header Injection via HttpProxyHandler Disabled Validation
Summary: CVE-2026-42578 netty: io.netty/netty-handler-proxy: Netty: HTTP Header Inject...
Keywords:
Status: NEW
Alias: CVE-2026-42578
Product: Security Response
Classification: Other
Component: vulnerability
Version: unspecified
Hardware: All
OS: Linux
high
high
Target Milestone: ---
Assignee: Product Security DevOps Team
QA Contact:
URL:
Whiteboard:
Depends On: 2482668
Blocks:
TreeView+ depends on / blocked
 
Reported: 2026-05-13 19:02 UTC by OSIDB Bzimport
Modified: 2026-05-28 12:22 UTC (History)
105 users (show)

Fixed In Version:
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Description OSIDB Bzimport 2026-05-13 19:02:23 UTC 
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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