{"id":"CVE-2026-72817","revision":"79b400f5f0434d31ba7e3090d1248ccf","records":[{"revision":"79b400f5f0434d31ba7e3090d1248ccf","observedAt":"2026-10-23T15:48:27.903+00:00","statement":{"source":"cve-program","id":"CVE-2026-72817","aliases":[],"title":"go-chi chi 0.9.0 before 5.3.0 IP Spoofing via X-Forwarded-For","description":"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.","state":0,"publishedAt":"2026-08-14T11:35:28.824+00:00","modifiedAt":"2026-10-08T15:24:32.174+00:00","affected":[{"ecosystem":"Vendor product","name":"chi","ranges":[],"versions":[],"rawVersionEvidence":"{\n                    \"vendor\": \"go-chi\",\n                    \"product\": \"chi\",\n                    \"defaultStatus\": \"unaffected\",\n                    \"packageURL\": \"pkg:golang/github.com/go-chi/chi\",\n                    \"versions\": [\n                        {\n                            \"version\": \"0.9.0\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"semver\",\n                            \"lessThan\": \"5.3.0\"\n                        },\n                        {\n                            \"version\": \"5.3.0\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        }\n                    ]\n                }"}],"metrics":[{"system":"CVSS 4.0","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","score":6.9,"severity":"MEDIUM"},{"system":"CVSS 3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N","score":6.5,"severity":"MEDIUM"}],"references":["https://github.com/go-chi/chi/security/advisories/GHSA-9g5q-2w5x-hmxf","https://www.vulncheck.com/advisories/go-chi-chi-before-ip-spoofing-via-x-forwarded-for"],"sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-72817","license":"CVE Program Terms of Use","key":"cve-program:CVE-2026-72817","identifiers":["CVE-2026-72817"]},"retained":false,"historicalAffected":[]}],"coverage":[]}