CVE-2026-79913Public exploitNetwork attack vectorHinoki check available

Internal data disclosure via IPv6-transition SSRF bypass

Published Sep 22, 2026 · Updated Sep 22, 2026

SSRF in Cloudreve 4.17.0 and earlier allows remote authenticated users to read internal service responses through remote downloads. ValidateExternalURL passes resolved NAT64, IPv4-compatible, and 6to4 addresses to checkIP without decoding their embedded IPv4 targets, so private destinations appear public. Remote-download access is required; successful requests expose internal-service data and can disclose cloud instance credentials.

CVSS severity6.5
Medium
EPSS probability0.40%
Next 30 days · Oct 19, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkAvailable
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Summary

What happened

SSRF in Cloudreve 4.17.0 and earlier allows remote authenticated users to read internal service responses through remote downloads. ValidateExternalURL passes resolved NAT64, IPv4-compatible, and 6to4 addresses to checkIP without decoding their embedded IPv4 targets, so private destinations appear public. Remote-download access is required; successful requests expose internal-service data and can disclose cloud instance credentials.

The record

CVE
CVE-2026-79913
Published
Sep 22, 2026
Updated
Sep 22, 2026
Vendor
Cloudreve
Product
Cloudreve
Classifications
T1552.005, T1190
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Sep 22, 2026CVE publishedPublication date reported by the CVE source.
  2. Sep 22, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=< 4.18.0

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Cloudreve · Cloudreveversion=< 4.18.0

Published CVSS scores

6.5GitHubCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Activity data is delayed. The latest report is Sep 28, 2026.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 22, 2026Sep 28, 2026
Latest reporting daySep 28, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

T1552.005Unsecured Credentials: Cloud Instance Metadata API
T1190Exploit Public-Facing Application

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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