Chi Client IP Spoofing in ClientIPFromXFF via X-Forwarded-For
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.
CVE-2026-114437
Primary source · Revision 1
Imported from structured advisory data. Source references identify upstream records or fields; verify affected versions and your deployed configuration.
Security context
Source reference: cve:CVE-2026-114437
chi
Source reference: /containers/cna/affected/0/product
- Affected versions
- Not stated in this record
- Fixed versions
- Not stated in this record
- Prerequisites
- Not stated in this record
Structured affected-version data
Original package identities and version rules from this source.
[
{
"vendor": "go-chi",
"product": "chi",
"versions": [
{
"status": "affected",
"version": "0",
"lessThan": "5.4.0",
"versionType": "semver"
}
],
"packageName": "github.com/go-chi/chi/v5",
"collectionURL": "https://pkg.go.dev",
"defaultStatus": "unaffected"
}
]- Related CVEs
- CVE-2026-114437
Source reference:
/cveMetadata/cveId
Publisher severity
medium
Source reference: /containers/cna/metrics
- Event
- #49318 · Revision 1
- Added to Heist Feed
- Publisher date