CVE-2026-72816
go-chi chi before 5.3.0 IP Spoofing via RealIP Middleware
- State
- Published
- Severity
- 6.9 Medium
- Published
- Aug 14, 2026
- Updated
- Oct 8, 2026
- Reserved
- Aug 10, 2026
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.
Scores
| CVSS | Score | Vector | Source |
|---|---|---|---|
| 4.0 | 6.9 Medium | 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 | VulnCheck |
| 3.1 | 6.5 Medium | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N | VulnCheck |
Weaknesses
- CWE-290 Authentication Bypass by Spoofing
Affected Products
| Product | Versions |
|---|---|
chigo-chi |
|
References
- GitHub Security Advisory (GHSA-rjr7-jggh-pgcp)vendor-advisory
- VulnCheck Advisory: go-chi chi before 5.3.0 IP Spoofing via RealIP Middlewarethird-party-advisory
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