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.

Upgrading to version 5.3.0 eliminates this vulnerability.

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/

CPE 2.3info

• 🔒
• 🔒

CPE 2.2info

• 🔒
• 🔒

CVSSv4info

CVSSv3info

CVSSv2info

Exploitinginfo

Threat Intelligenceinfo

Countermeasuresinfo

Timelineinfo

Sourcesinfo

Entryinfo

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

Discussion