CVE-2026-72816 — go-chi chi before 5.3.0 IP Spoofing via RealIP Middleware
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-Clien…
Published: 2026-08-14 · CVSS: 6.9 · CVSS 4.0
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 · Revision 8b16575c39f1e1810c5e863010da073d2d3285e7