CVE-2026-72816: Go-Chi Chi

Medium severity, CVSS 6.5. EPSS: 0.3% chance of exploitation in the next 30 days.

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.

Affected products

• Go-Chi Chi: before 5.3.0 (fixed in 5.3.0)

Published 2026-08-14. Last modified 2026-10-08.