CVE-2026-72816
Medium
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.
SeverityMedium
CVSS6.5
Exploit probability—
ProductGithub.com/go-chi/chi/middleware
PublishedAug 14, 2026
First seenAug 14, 2026
Weakness typeCWE-290CWE-290
How to fix
Update
- github.com/go-chi/chi/v5/middleware5.3.0 or later
- github.com/go-chi/chi/v55.3.0 or later
Vendor advisories
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| github.com/go-chi/chi/middlewareGo | v ≤ 1.5.5 | — |
| github.com/go-chi/chi/v2/middlewareGo | v ≤ 2.1.1 | — |
| github.com/go-chi/chi/v3/middlewareGo | v ≤ 3.3.5 | — |
| github.com/go-chi/chi/v4/middlewareGo | v ≤ 4.1.3 | — |
| github.com/go-chi/chi/v5/middlewareGo | v < 5.3.0 | 5.3.0 |
| github.com/go-chi/chi/v5Go | v < 5.3.0 | 5.3.0 |
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