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Advisory record · GHSA-jvh5-97xg-v99f

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

CVSS 6.5 MediumEPSS 0.0040 · 34th percentile

Published by the GitHub Advisory Database at 22 Sept 2026, 20:40 UTC. agentprime has not analysed this yet, so whether it affects any app is not known.

PackageEcosystemAffectedFixed in
github.com/cloudreve/Cloudreve/v4Go<4.0.0-20260715072853-1c5cad6dec7e4.0.0-20260715072853-1c5cad6dec7e
Identifiers
GHSA-jvh5-97xg-v99f · CVE-2026-79913 · GO-2026-6572
Weakness (CWE)
CWE-697 · CWE-918
Tags
Published
22 Sept 2026
Updated
1 Oct 2026

Machine-written summary

Summary written by Claude Haiku from the source advisory. Not reviewed by a person.

Cloudreve versions up to and including 4.0.0-20260715072853-1c5cad6dec7e (Go module github.com/cloudreve/Cloudreve/v4) have a server-side request forgery guard that fails to classify IPv6 addresses wrapping internal IPv4 addresses, such as NAT64, IPv4-compatible and 6to4 forms. An authenticated user who can use remote download can make the server fetch internal addresses, including cloud metadata endpoints, and read the responses. Upgrade to 4.0.0-20260715072853-1c5cad6dec7e, which is listed as the fixed version.

Written 1 Nov 2026.

Not analysed yet

We haven’t published our analysis of this Advisory yet. Once a person has reviewed it, this page will say what’s vulnerable, what has to be true for your app to be affected, and how to check.

Severity and exploitation

ScoreRatingCVSSVectorSource
6.5 Medium 3.1 CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N CNA (GitHub_M)
  • CISA KEV Not listed.
  • EPSS 0.0040, the 34th percentile, on 5 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.

Timeline

  1. 31 Oct 2026, 14:12 UTC First seen by agentprime
  2. 31 Oct 2026, 14:12 UTC Confirmed by OSV

Sources

Facts on this page come from the GitHub Advisory Database (CC-BY 4.0), OSV and the other sources listed, as published. We don’t reproduce full advisory descriptions, which can contain exploit code.