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CVE-2026-79913— Cloudreve: SSRF guard bypass: checkIP does not decode IPv6-transition wrappers (NAT64, IPv4-compatible, 6to4) reaching internal and cloud-metadata addresses

Quick assessment

Affected
cloudreve cloudreve
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

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

CVSS 6.5 · Medium

Affected Version Matrix 1

VendorProduct Version RangeStatus
cloudreve cloudreve < 4.18.0 affected
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I. Basic Information for CVE-2026-79913

Vulnerability Information

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Vulnerability Title
Cloudreve: SSRF guard bypass: checkIP does not decode IPv6-transition wrappers (NAT64, IPv4-compatible, 6to4) reaching internal and cloud-metadata addresses
Source: CVE Program / CVE List V5
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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
服务端请求伪造(SSRF)
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
cloudreve cloudreve < 4.18.0 -

II. Public POCs for CVE-2026-79913

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III. Intelligence Information for CVE-2026-79913

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Patches & Fixes for CVE-2026-79913 (1)

Other References for CVE-2026-79913 (2)

Same Patch Batch · cloudreve · 2026-09-22 · 3 CVEs total

CVE-2026-77633 7.1 HIGH Cloudreve: Storage-quota TOCTOU race allows quota bypass and storage-based denial of servi
CVE-2026-77637 3.8 LOW Cloudreve: Privilege Scope Bypass: State-Mutating Admin Operations Accessible via Read-Onl

IV. Related Vulnerabilities

Same product: cloudreve
Same vendor: cloudreve
Same weakness: CWE-918

V. Comments for CVE-2026-79913

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