CVE-2026-55497 Details
Description
Cloudreve is a self-hosted file management and sharing system. Prior to 4.17.0, the built-in thumbnail and avatar image decoders limit compressed file size but do not limit decoded pixel dimensions, allowing an authenticated user to submit a small PNG, JPEG, or GIF that triggers an unbounded allocation and terminates the Cloudreve process through fatal out-of-memory behavior. This issue is fixed in version 4.17.0.
A denial-of-service vulnerability has been identified in Cloudreve, a self-hosted file management and sharing system, prior to version 4.17.0. The issue arises in the built-in thumbnail and avatar image decoders, which, while limiting compressed file sizes, fail to restrict decoded pixel dimensions. This oversight allows an authenticated user to upload a small PNG, JPEG, or GIF that triggers excessive memory allocation, causing the Cloudreve process to crash due to out-of-memory errors. The vulnerability can be exploited through avatar uploads or by generating thumbnails for shared files.
Users can update to Cloudreve version 4.17.0 or later, where this vulnerability has been fixed.
Metrics
CVSS 4.0 Severity and Vector Strings:
VolerionCVSS 3.x Severity and Vector Strings:
No data available for CVSS Version 2.0 on this CVE.
Volerion
Assessed Jul 31, 2026CISA-ADP
Assessed Jul 31, 2026References to Advisories, Solutions, and Tools
By selecting these links, you will be leaving this site. These are references gathered from the official CVE record and are not endorsed by Volerion.
| URL | Source(s) | Tag(s) |
|---|---|---|
| https://github.com/cloudreve/cloudreve/security/advisories/GHSA-g9j2-8w95-3vwv | CISA-ADP | AdvisoryExploitRemedyVendor |
| https://github.com/cloudreve/cloudreve/commit/3607f79bb44c35d0be4fa8b6e24c0502b51415a9 | [email protected] | Source CodeVendor |
| https://github.com/cloudreve/cloudreve/releases/tag/4.17.0 | [email protected] | Release NotesVendor |
| https://github.com/cloudreve/cloudreve/security/advisories/GHSA-g9j2-8w95-3vwv | [email protected] | AdvisoryExploitRemedyVendor |
Weakness Enumeration
| CWE-ID | CWE Name | Source |
|---|---|---|
| CWE-400 | Uncontrolled Resource Consumption | [email protected] |
| CWE-409 | Improper Handling of Highly Compressed Data (Data Amplification) | [email protected] |
| CWE-770 | Allocation of Resources Without Limits or Throttling | [email protected] |
Affected Products
| Product | Versions |
|---|---|
| Cloudreve | < 4.16.1 (semver) |
CPE
Remediation
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Change History
2 change records found show changes
| Date | Action | Recorded By |
|---|---|---|
| Jul 31, 2026 | CVE Modified | CISA-ADP |
| Jul 31, 2026 | New CVE Received | [email protected] |