{"id":"CVE-2026-79913","revision":"fd84c394f8394ec5bf4ba39ccd4304ef","records":[{"revision":"fd84c394f8394ec5bf4ba39ccd4304ef","observedAt":"2026-10-23T15:48:27.903+00:00","statement":{"source":"cve-program","id":"CVE-2026-79913","aliases":[],"title":"Cloudreve: SSRF guard bypass: checkIP does not decode IPv6-transition wrappers (NAT64, IPv4-compatible, 6to4) reaching internal and cloud-metadata addresses","description":"Cloudreve is a self-hosted file management and sharing system. Prior to 4.18.0, the ValidateExternalURL server-side request forgery guard in pkg/request/ssrf.go passes resolved addresses to checkIP without decoding NAT64, IPv4-compatible, and 6to4 IPv4-in-IPv6 transition forms. An authenticated user with remote-download access can provide SrcUri through RemoteDownloadTask.createDownloadTask so a wrapper embedding a loopback, private, link-local, or cloud metadata IPv4 address is classified as public and fetched, exposing internal service responses and cloud instance credentials. IPv4-mapped IPv6 addresses remain blocked because Go converts that form with net.IP.To4. This issue is fixed in version 4.18.0.","state":0,"publishedAt":"2026-09-22T15:24:33.456+00:00","modifiedAt":"2026-09-22T17:44:01.258+00:00","affected":[{"ecosystem":"Vendor product","name":"cloudreve","ranges":[],"versions":[],"rawVersionEvidence":"{\n                    \"vendor\": \"cloudreve\",\n                    \"product\": \"cloudreve\",\n                    \"versions\": [\n                        {\n                            \"version\": \"< 4.18.0\",\n                            \"status\": \"affected\"\n                        }\n                    ]\n                }"}],"metrics":[{"system":"CVSS 3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N","score":6.5,"severity":"MEDIUM"}],"references":["https://github.com/cloudreve/cloudreve/security/advisories/GHSA-jvh5-97xg-v99f","https://github.com/cloudreve/cloudreve/commit/1c5cad6dec7ec3037c6479e3a26a3909995d16a2","https://github.com/cloudreve/cloudreve/releases/tag/4.18.0"],"sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-79913","license":"CVE Program Terms of Use","key":"cve-program:CVE-2026-79913","identifiers":["CVE-2026-79913"]},"retained":false,"historicalAffected":[]}],"coverage":[]}