Vulnerability 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 Score
MEDIUM
Related Weaknesses (CWE)
References
- https://github.com/cloudreve/cloudreve/commit/1c5cad6dec7ec3037c6479e3a26a390999
- https://github.com/cloudreve/cloudreve/releases/tag/4.18.0
- https://github.com/cloudreve/cloudreve/security/advisories/GHSA-jvh5-97xg-v99f
FAQ
What is CVE-2026-79913?
CVE-2026-79913 is a vulnerability with a CVSS score of 6.5 (MEDIUM). 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 wi...
How severe is CVE-2026-79913?
CVE-2026-79913 has been rated MEDIUM with a CVSS base score of 6.5/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2026-79913?
Check the references section above for vendor advisories and patch information. Review vendor security bulletins for remediation guidance.