{"cve":"CVE-2026-79913","nvd":{"published":"2026-09-22T16:17:57.033","modified":"2026-09-22T18:17:19.667","status":"Deferred","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.","cvss_v4":null,"cvss_v3":{"version":"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},"cwes":["CWE-697","CWE-918"],"references":["https://github.com/cloudreve/cloudreve/commit/1c5cad6dec7ec3037c6479e3a26a3909995d16a2","https://github.com/cloudreve/cloudreve/releases/tag/4.18.0","https://github.com/cloudreve/cloudreve/security/advisories/GHSA-jvh5-97xg-v99f"],"products":[],"source":"nvd","synced_at":"2026-10-19T22:56:02.509636177+00:00"},"epss":{"cve":"CVE-2026-79913","score":0.00402,"percentile":0.34428,"date":"2026-10-31"},"kev":null,"osv":[{"id":"GHSA-jvh5-97xg-v99f","url":"https://osv.dev/vulnerability/GHSA-jvh5-97xg-v99f","summary":"Cloudreve: SSRF guard bypass: checkIP does not decode IPv6-transition wrappers (NAT64, IPv4-compatible, 6to4) reaching internal and cloud-metadata addresses","modified":"2026-10-01T20:56:00.080110460Z","packages":[{"ecosystem":"Go","name":"github.com/cloudreve/Cloudreve/v4","purl":"pkg:golang/github.com/cloudreve/Cloudreve/v4","ranges":["<4.0.0-20260715072853-1c5cad6dec7e"],"fixed":["4.0.0-20260715072853-1c5cad6dec7e"]}]},{"id":"GO-2026-6572","url":"https://osv.dev/vulnerability/GO-2026-6572","summary":"Cloudreve: SSRF guard bypass: checkIP does not decode IPv6-transition wrappers (NAT64, IPv4-compatible, 6to4) reaching internal and cloud-metadata addresses in github.com/cloudreve/Cloudreve","modified":"2026-10-01T20:45:14.077740531Z","packages":[{"ecosystem":"Go","name":"github.com/cloudreve/Cloudreve","purl":"pkg:golang/github.com/cloudreve/Cloudreve","ranges":["all versions"],"fixed":[]},{"ecosystem":"Go","name":"github.com/cloudreve/Cloudreve/v3","purl":"pkg:golang/github.com/cloudreve/Cloudreve/v3","ranges":["all versions"],"fixed":[]},{"ecosystem":"Go","name":"github.com/cloudreve/Cloudreve/v4","purl":"pkg:golang/github.com/cloudreve/Cloudreve/v4","ranges":["<4.0.0-20260715072853-1c5cad6dec7e"],"fixed":["4.0.0-20260715072853-1c5cad6dec7e"]}]}],"attribution":["This product uses the NVD API but is not endorsed or certified by the NVD.","EPSS scores: FIRST Exploit Prediction Scoring System, https://www.first.org/epss","Known exploited vulnerabilities: CISA Known Exploited Vulnerabilities Catalog, https://www.cisa.gov/known-exploited-vulnerabilities-catalog","Package advisories: OSV (https://osv.dev), from the GitHub Advisory Database, PyPA, Go, RustSec and other ecosystem databases, under CC-BY 4.0 or CC0","CVE records: the CVE Program's CVE List (https://www.cve.org), under its terms of use (https://www.cve.org/Legal/TermsOfUse). CVE is a registered trademark of The MITRE Corporation; this product is not affiliated with the CVE Program."]}