CVE-2026-72815
go-chi chi v5.2.1 IP Spoofing via X-Forwarded-For Header
- State
- Published
- Severity
- 6.9 Medium
- Published
- Aug 14, 2026
- Updated
- Oct 8, 2026
- Reserved
- Aug 10, 2026
Description
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.
Scores
| CVSS | Score | Vector | Source |
|---|---|---|---|
| 4.0 | 6.9 Medium | 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 | VulnCheck |
Weaknesses
- CWE-290 Authentication Bypass by Spoofing
Affected Products
| Product | Versions |
|---|---|
chigo-chi |
|
References
- GitHub Security Advisory (GHSA-3fxj-6jh8-hvhx)vendor-advisory
- VulnCheck Advisory: go-chi chi v5.2.1 IP Spoofing via X-Forwarded-For Headerthird-party-advisory
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