go-chi up to 5.2.1 RealIP Middleware middleware/realip.go realIP access control

Summaryinfo

A vulnerability, which was classified as critical, was found in go-chi chi up to 5.2.1. This vulnerability affects the function realIP of the file middleware/realip.go of the component RealIP Middleware. Executing a manipulation can lead to access control. This vulnerability is handled as CVE-2026-72816. The attack can be executed remotely. There is not any exploit available.

Detailsinfo

A vulnerability was found in go-chi chi up to 5.2.1. It has been declared as critical. This vulnerability affects the function realIP of the file middleware/realip.go of the component RealIP Middleware. The manipulation with an unknown input leads to a access control vulnerability. The CWE definition for the vulnerability is CWE-284. The product does not restrict or incorrectly restricts access to a resource from an unauthorized actor. As an impact it is known to affect confidentiality, integrity, and availability. CVE summarizes:

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.

The advisory is available at github.com. This vulnerability was named CVE-2026-72816 since 08/10/2026. The exploitation appears to be easy. The attack can be initiated remotely. No form of authentication is required for a successful exploitation. Technical details are known, but there is no available exploit. This vulnerability is assigned to T1068 by the MITRE ATT&CK project.

The vulnerability scanner Nessus provides a plugin with the ID 341541 (openSUSE 16 Security Update : cloudflared (openSUSE-SU-2026:21670-1)), which helps to determine the existence of the flaw in a target environment.

Upgrading to version 5.3.0 eliminates this vulnerability.

The vulnerability is also documented in the vulnerability database at Tenable (341541). If you want to get best quality of vulnerability data, you may have to visit VulDB.

Productinfo

Vendor

• go-chi

Name

• chi

Version

• 5.2.0
• 5.2.1

Website

• Product: https://github.com/go-chi/chi/

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If you want to get best quality of vulnerability data, you may have to visit VulDB.

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