CVE-2026-72815

go-chi chi versions >= 5.2.1 and before 5.3.0 contain an IP spoofing vulnerability in the RealIP middleware, which blindly trusts the first (leftmost) value of the X-Forwarded-For HTTP header. A remote attacker can bypass IP-based access control lists and rate-limiting mechanisms, and forge log entries, by supplying a spoofed IP address in the X-Forwarded-For header. The issue is fixed in version 5.3.0.

Affected products

Go-Chi

Fix

Available

CVSS 4.0

6.9 MEDIUM

EPSS

0.4% (33th percentile)

Weakness

CWE-290

NVD status

Received

Published

2026-08-14