{"id":"CVE-2026-72815","revision":"92515273402548199f538a2e2c850605","records":[{"revision":"92515273402548199f538a2e2c850605","observedAt":"2026-10-23T15:48:27.903+00:00","statement":{"source":"cve-program","id":"CVE-2026-72815","aliases":[],"title":"go-chi chi v5.2.1 IP Spoofing via X-Forwarded-For Header","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.","state":0,"publishedAt":"2026-08-14T11:35:27.496+00:00","modifiedAt":"2026-10-08T15:24:31.089+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/v5\",\n                    \"versions\": [\n                        {\n                            \"version\": \"5.2.1\",\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"}],"references":["https://github.com/go-chi/chi/security/advisories/GHSA-3fxj-6jh8-hvhx","https://www.vulncheck.com/advisories/go-chi-chi-ip-spoofing-via-x-forwarded-for-header"],"sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-72815","license":"CVE Program Terms of Use","key":"cve-program:CVE-2026-72815","identifiers":["CVE-2026-72815"]},"retained":false,"historicalAffected":[]}],"coverage":[]}