go-chi chi 0.9.0 before 5.3.0 IP Spoofing via X-Forwarded-For
CVE-2026-72817 is fixed in 6 products on 1 platform, first by DEBIAN-CVE-2026-72817, released August 14, 2026. It is not reported as exploited. Patch Radar priority: Routine.
go-chi/chi versions 0.9.0 before 5.3.0 contains an IP spoofing vulnerability in the RealIP middleware, which resolves the request source IP (Request.RemoteAddr) using the first IP in the X-Forwarded-For header without validating trusted proxies. A malicious client can prepend a forged IP as the first value of the X-Forwarded-For header to spoof the request source IP, potentially bypassing access controls or falsifying request logs.
Where it's fixed
| Product | Fixed in | Fix | Released |
|---|---|---|---|
| Linux | |||
| cloudflared · opensuse-leap 16.0 | 2026.8.2-bp160.1.1 | OPENSUSE-SU-2026:21670-1 | Aug 27, 2026 |
| golang-github-go-chi-chi · Debian 14 | 5.3.0-1 | DEBIAN-CVE-2026-72817 | Aug 14, 2026 |
| hauler · opensuse-leap 16.0 | 2.1.0-bp160.1.1 | OPENSUSE-SU-2026:21793-1 | Sep 3, 2026 |
| trivy · opensuse-leap 16.0 | 0.74.0-160000.1.1 | OPENSUSE-SU-2026:21645-1 | Aug 25, 2026 |
| v2ray-core · opensuse-leap 16.0 | 5.53.0-bp160.1.1 | OPENSUSE-SU-2026:21653-1 | Aug 25, 2026 |
| warewulf4 · opensuse-leap 16.0 | 4.7.1-bp160.1.1 | OPENSUSE-SU-2026:21918-1 | Sep 18, 2026 |
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