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CVE-2026-72817— go-chi chi 0.9.0 before 5.3.0 IP Spoofing 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.

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 0.9.0至5.3.0之前版本存在输入验证错误漏洞，该漏洞源于RealIP中间件未验证可信代理，直接使用X-Forwarded-For头中的第一个IP作为请求源IP，可能导致IP欺骗，绕过访问控制或伪造请求日志。

CVSS 6.5 · Medium EPSS 0.24% · P14

Possible ATT&CK Techniques 1 AI

T1078 · Valid Accounts

Affected Version Matrix 2

VendorProduct Version RangeStatus
go-chi chi 0.9.0< 5.3.0 affected
5.3.0 unaffected
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I. Basic Information for CVE-2026-72817

Vulnerability Information
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Vulnerability Title
go-chi chi 0.9.0 before 5.3.0 IP Spoofing via X-Forwarded-For
Source: CVE Program / CVE List V5
Vulnerability Description
go-chi/chi versions 0.9.0 before 5.3.0 contains an IP spoofing vulnerability in the RealIP middleware, which resolves the request source IP (Request.RemoteAddr) using the first IP in the X-Forwarded-For header without validating trusted proxies. A malicious client can prepend a forged IP as the first value of the X-Forwarded-For header to spoof the request source IP, potentially bypassing access controls or falsifying request logs.
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
对数据真实性的验证不充分
Source: CVE Program / CVE List V5
Vulnerability Title
go-chi chi 输入验证错误漏洞
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 0.9.0至5.3.0之前版本存在输入验证错误漏洞，该漏洞源于RealIP中间件未验证可信代理，直接使用X-Forwarded-For头中的第一个IP作为请求源IP，可能导致IP欺骗，绕过访问控制或伪造请求日志。
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 0.9.0 ~ 5.3.0 -

II. Public POCs for CVE-2026-72817

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III. Intelligence Information for CVE-2026-72817

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Vendor Advisories for CVE-2026-72817 (1)

Other References for CVE-2026-72817 (1)

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-2026-72816 6.5 MEDIUM go-chi chi before 5.3.0 IP Spoofing via RealIP Middleware
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-345

V. Comments for CVE-2026-72817

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