Cloudreve up to 4.17.x ValidateExternalURL pkg/request/ssrf.go checkIP SrcUri server-side request forgery

Summaryinfo

A vulnerability labeled as problematic has been found in Cloudreve up to 4.17.x. The affected element is the function checkIP of the file pkg/request/ssrf.go of the component ValidateExternalURL. Executing a manipulation of the argument SrcUri can lead to server-side request forgery. This vulnerability is tracked as CVE-2026-79913. The attack can be launched remotely. No exploit exists. The affected component should be upgraded.

Detailsinfo

A vulnerability classified as problematic was found in Cloudreve up to 4.17.x. This vulnerability affects the function checkIP of the file pkg/request/ssrf.go of the component ValidateExternalURL. The manipulation of the argument SrcUri with an unknown input leads to a server-side request forgery vulnerability. The CWE definition for the vulnerability is CWE-918. The web server receives a URL or similar request from an upstream component and retrieves the contents of this URL, but it does not sufficiently ensure that the request is being sent to the expected destination. As an impact it is known to affect confidentiality. CVE summarizes:

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.

The advisory is available at github.com. This vulnerability was named CVE-2026-79913 since 08/25/2026. The exploitation appears to be easy. The attack can be initiated remotely. Technical details are known, but there is no available exploit.

Upgrading to version 4.18.0 eliminates this vulnerability.

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Productinfo

Type

• Cloud Software

Name

• Cloudreve

Version

• 4.0
• 4.1
• 4.2
• 4.3
• 4.4
• 4.5
• 4.6
• 4.7
• 4.8
• 4.9
• 4.10
• 4.11
• 4.12
• 4.13
• 4.14
• 4.15
• 4.16
• 4.17

Website

• Product: https://github.com/cloudreve/cloudreve/

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