CVSS 3.1
6.5 mediumCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:NCVE-2026-79913
Medium (6.5). EPSS 0.4% chance of exploitation in the next 30 days. Fixed in github.com/cloudreve/Cloudreve/v4 4.0.0-20260715072853-1c5cad6dec7e.
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.
Severity
- EPSS
- 0.4% chance of exploitation in the next 30 days; higher than 34% of CVEs (scores of 2026-10-31)
- CWEs
- CWE-697, CWE-918
- Published
- Modified
- Record from
- the NVD, synced
Packages (OSV)
| Advisory | Ecosystem | Package | Affected | Fixed in |
|---|---|---|---|---|
| GHSA-jvh5-97xg-v99f | Go | github.com/cloudreve/Cloudreve/v4 | <4.0.0-20260715072853-1c5cad6dec7e | 4.0.0-20260715072853-1c5cad6dec7e |
| GO-2026-6572 | Go | github.com/cloudreve/Cloudreve | all versions | no fix published |
| GO-2026-6572 | Go | github.com/cloudreve/Cloudreve/v3 | all versions | no fix published |
| GO-2026-6572 | Go | github.com/cloudreve/Cloudreve/v4 | <4.0.0-20260715072853-1c5cad6dec7e | 4.0.0-20260715072853-1c5cad6dec7e |