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CVE-2026-114437— Chi Client IP Spoofing in ClientIPFromXFF via X-Forwarded-For

Quick assessment

Affected
go-chi chi
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

在 Golang Chi Web 框架中， 中间件会跳过配置的可信 CIDR 范围内的任何 条目，但从未验证 中的直接 TCP 对等端是否属于该 CIDR。因此，能够直接访问 Go 服务器的客户端可以附加一个看似可信的代理地址，并由此操控中间件 方法返回的客户端 IP。 此问题影响 Chi 框架 5.4.0 之前的所有版本。

CVSS 4.8 · Medium

Affected Version Matrix 1

VendorProduct Version RangeStatus
go-chi chi < 5.4.0 affected
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I. Basic Information for CVE-2026-114437

Vulnerability Information
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Vulnerability Title
Chi Client IP Spoofing in ClientIPFromXFF via X-Forwarded-For
Source: CVE Program / CVE List V5
Vulnerability Description
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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
使用不可信的源
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
go-chi chi 0 ~ 5.4.0 -

II. Public POCs for CVE-2026-114437

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III. Intelligence Information for CVE-2026-114437

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Other References for CVE-2026-114437 (2)

IV. Related Vulnerabilities

Same product: chi
Same vendor: go-chi
Same weakness: CWE-348

V. Comments for CVE-2026-114437

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