What is CVE-2026-79913?

CVE-2026-79913 is a medium-severity vulnerability in Cloudreve, classified under Incorrect Comparison. CVSS score: 6.5/10. Published 2026-09-22.

How severe is CVE-2026-79913?

Medium severity. CVSS v3 base score is 6.5 out of 10.

SSRF in Cloudreve

CVE-2026-79913

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.

Published 2026-09-22 · last modified 2026-09-22.

CVSS v3 metric

CVSS v3 base score 6.5 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N.

EPSS exploit prediction

No EPSS score from FIRST.org yet. New CVEs usually get one within a few days; no score means no signal yet, not low risk. How EPSS works.

Affected products

Cloudreve — versions < 4.18.0

Weakness classification (CWE)

References

Frequently asked questions

What is CVE-2026-79913?: CVE-2026-79913 is a medium-severity vulnerability in Cloudreve, classified under Incorrect Comparison. CVSS score: 6.5/10. Published 2026-09-22.
How severe is CVE-2026-79913?: Medium severity. CVSS v3 base score is 6.5 out of 10.