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.
History

Fri, 14 Aug 2026 16:30:00 +0000

Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'yes', 'Exploitation': 'poc', 'Technical Impact': 'partial'}, 'version': '2.0.3'}


Fri, 14 Aug 2026 13:15:00 +0000

Type Values Removed Values Added
First Time appeared Go-chi
Go-chi chi
Vendors & Products Go-chi
Go-chi chi

Fri, 14 Aug 2026 11:45:00 +0000

Type Values Removed Values Added
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.
Title go-chi chi before 5.3.0 IP Spoofing via RealIP Middleware
Weaknesses CWE-290
References
Metrics cvssV3_1

{'score': 6.5, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N'}

cvssV4_0

{'score': 6.9, 'vector': 'CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N'}


cve-icon MITRE

Status: PUBLISHED

Assigner: VulnCheck

Published:

Updated: 2026-08-14T15:22:35.592Z

Reserved: 2026-08-10T15:12:16.754Z

Link: CVE-2026-72816

cve-icon Vulnrichment

Updated: 2026-08-14T15:22:12.391Z

cve-icon NVD

Status : Received

Published: 2026-08-14T12:16:44.620

Modified: 2026-08-14T16:16:59.857

Link: CVE-2026-72816

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

Updated: 2026-08-14T13:00:11Z