{"id":"CVE-2026-79913","published":"2026-09-22T16:17:57.033","lastModified":"2026-09-22T18:17:19.667","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.","cvssScore":6.5,"cvssSeverity":"MEDIUM","cvssVector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N","cwes":["CWE-697","CWE-918"],"vendors":[],"products":[],"references":[{"url":"https://github.com/cloudreve/cloudreve/commit/1c5cad6dec7ec3037c6479e3a26a3909995d16a2","tags":[]},{"url":"https://github.com/cloudreve/cloudreve/releases/tag/4.18.0","tags":[]},{"url":"https://github.com/cloudreve/cloudreve/security/advisories/GHSA-jvh5-97xg-v99f","tags":[]}],"exploitRefs":[{"url":"https://github.com/cloudreve/cloudreve/commit/1c5cad6dec7ec3037c6479e3a26a3909995d16a2","tags":[]},{"url":"https://github.com/cloudreve/cloudreve/releases/tag/4.18.0","tags":[]},{"url":"https://github.com/cloudreve/cloudreve/security/advisories/GHSA-jvh5-97xg-v99f","tags":[]}],"hasPoc":true,"ai":null}