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CVE-2026-72816— go-chi chi before 5.3.0 IP Spoofing via RealIP Middleware

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.

go-chi chi是go-chi组织开源的一个轻量级、符合 Go 语言习惯且可组合的路由工具。 go-chi chi 5.2.1及之前版本存在授权问题漏洞，该漏洞源于RealIP中间件（middleware/realip.go）中的realIP()函数未验证请求是否来自受信任代理，读取客户端控制的True-Client-IP、X-Real-IP、X-Forwarded-For头信息并覆盖r.RemoteAddr，可能导致攻击者伪造IP地址绕过基于IP的访问控制、规避速率限制和地域限制，并污染审计日志。

CVSS 6.5 · Medium EPSS 0.30% · P22

Affected Version Matrix 2

VendorProduct Version RangeStatus
go-chi chi < 5.3.0 affected
5.3.0 unaffected
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I. Basic Information for CVE-2026-72816

Vulnerability Information
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Vulnerability Title
go-chi chi before 5.3.0 IP Spoofing via RealIP Middleware
Source: CVE Program / CVE List V5
Vulnerability Description
go-chi/chi through 5.2.1 contains an IP spoofing vulnerability in the RealIP middleware (middleware/realip.go). The realIP() function reads client-controlled headers (True-Client-IP, X-Real-IP, and X-Forwarded-For) and overwrites r.RemoteAddr without verifying that the request originated from a trusted proxy. Attackers can supply arbitrary IP addresses in these headers to bypass IP-based access controls, evade rate limiting and geo-IP restrictions, and pollute audit logs. Fixed in 5.3.0.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
使用欺骗进行的认证绕过
Source: CVE Program / CVE List V5
Vulnerability Title
go-chi chi 授权问题漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
go-chi chi是go-chi组织开源的一个轻量级、符合 Go 语言习惯且可组合的路由工具。 go-chi chi 5.2.1及之前版本存在授权问题漏洞，该漏洞源于RealIP中间件（middleware/realip.go）中的realIP()函数未验证请求是否来自受信任代理，读取客户端控制的True-Client-IP、X-Real-IP、X-Forwarded-For头信息并覆盖r.RemoteAddr，可能导致攻击者伪造IP地址绕过基于IP的访问控制、规避速率限制和地域限制，并污染审计日志。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
go-chi chi 0 ~ 5.3.0 -

II. Public POCs for CVE-2026-72816

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III. Intelligence Information for CVE-2026-72816

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Vendor Advisories for CVE-2026-72816 (2)

Same Patch Batch · go-chi · 2026-08-14 · 4 CVEs total

CVE-2026-72815 6.9 MEDIUM go-chi chi v5.2.1 IP Spoofing via X-Forwarded-For Header
CVE-2026-72817 6.5 MEDIUM go-chi chi 0.9.0 before 5.3.0 IP Spoofing via X-Forwarded-For
CVE-2025-71405 5.1 MEDIUM go-chi chi before v5.2.2 Open Redirect via RedirectSlashes

IV. Related Vulnerabilities

Same product: chi
Same vendor: go-chi
Same weakness: CWE-290

V. Comments for CVE-2026-72816

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