Bug 2558305 (CVE-2026-114437) - CVE-2026-114437 github.com/go-chi/chi: chi: client IP spoofing via unverified direct connection in ClientIPFromXFF middleware
Summary: CVE-2026-114437 github.com/go-chi/chi: chi: client IP spoofing via unverified...
Keywords:
Status: NEW
Alias: CVE-2026-114437
Product: Security Response
Classification: Other
Component: vulnerability
Version: unspecified
Hardware: All
OS: Linux
medium
medium
Target Milestone: ---
Assignee: Product Security
QA Contact:
URL:
Whiteboard:
Depends On: 2558812 2558813
Blocks:
TreeView+ depends on / blocked
 
Reported: 2026-10-21 14:03 UTC by OSIDB Bzimport
Modified: 2026-10-22 10:57 UTC (History)
59 users (show)

Fixed In Version:
Clone Of:
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Description OSIDB Bzimport 2026-10-21 14:03:34 UTC 
In the Golang Chi web framework, the ClientIPFromXFF middleware skips any X-Forwarded-For entry in a configured trusted CIDR but never verifies that the direct TCP peer in http.Request.RemoteAddr belongs to that CIDR. A client that can reach the Go server directly can therefore append a trusted-looking proxy address and choose the client IP returned by middleware.GetClientIP.

This issue affects chi before 5.4.0.
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