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CVE-2026-72815— go-chi chi v5.2.1 IP Spoofing via X-Forwarded-For Header

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版本至5.3.0之前版本存在授权问题漏洞，该漏洞源于RealIP中间件盲目信任X-Forwarded-For HTTP标头的第一个值，可能导致远程攻击者绕过基于IP的访问控制列表和速率限制机制，并伪造日志条目。

CVSS 6.9 · Medium EPSS 0.50% · P41

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application

Affected Version Matrix 2

VendorProduct Version RangeStatus
go-chi chi 5.2.1< 5.3.0 affected
5.3.0 unaffected
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I. Basic Information for CVE-2026-72815

Vulnerability Information
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Vulnerability Title
go-chi chi v5.2.1 IP Spoofing via X-Forwarded-For Header
Source: CVE Program / CVE List V5
Vulnerability Description
go-chi chi versions >= 5.2.1 and before 5.3.0 contain an IP spoofing vulnerability in the RealIP middleware, which blindly trusts the first (leftmost) value of the X-Forwarded-For HTTP header. A remote attacker can bypass IP-based access control lists and rate-limiting mechanisms, and forge log entries, by supplying a spoofed IP address in the X-Forwarded-For header. The issue is fixed in version 5.3.0.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:L/VA:N/SC:N/SI:N/SA: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版本至5.3.0之前版本存在授权问题漏洞，该漏洞源于RealIP中间件盲目信任X-Forwarded-For HTTP标头的第一个值，可能导致远程攻击者绕过基于IP的访问控制列表和速率限制机制，并伪造日志条目。
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 5.2.1 ~ 5.3.0 -

II. Public POCs for CVE-2026-72815

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III. Intelligence Information for CVE-2026-72815

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Vendor Advisories for CVE-2026-72815 (2)

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

CVE-2026-72817 6.5 MEDIUM go-chi chi 0.9.0 before 5.3.0 IP Spoofing via X-Forwarded-For
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-290

V. Comments for CVE-2026-72815

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