Cloudreve: Server crash through image decompression/pixel bomb in thumbnail & avatar decoding (DoS)

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-55497
StatePUBLISHED
AssignerGitHub_M
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-07-31 04:17:23 UTC
Updated2026-07-31 16:17:07 UTC
DescriptionCloudreve 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.

Risk And Classification

Primary CVSS: v3.1 6.5 MEDIUM from [email protected]

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

EPSS: 0.005310000 probability, percentile 0.418990000 (date 2026-08-04)

Problem Types: CWE-400 | CWE-409 | CWE-770 | CWE-400 CWE-400: Uncontrolled Resource Consumption | CWE-409 CWE-409: Improper Handling of Highly Compressed Data (Data Amplification) | CWE-770 CWE-770: Allocation of Resources Without Limits or Throttling

VersionSourceTypeScoreSeverityVector
3.1[email protected]Secondary6.5MEDIUMCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
3.1CNADECLARED6.5MEDIUMCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

CVSS v3.1 Breakdown

Attack Vector
Network
Attack Complexity
Low
Privileges Required
Low
User Interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
None
Availability
High

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

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Cloudreve Cloudreve affected < 4.17.0 Not specified

References

ReferenceSourceLinkTags
github.com/cloudreve/cloudreve/commit/3607f79bb44c35d0be4fa8b6e24c0502b5... [email protected] github.com
github.com/cloudreve/cloudreve/releases/tag/4.17.0 [email protected] github.com
github.com/cloudreve/cloudreve/security/advisories/GHSA-g9j2-8w95-3vwv 134c704f-9b21-4f2e-91b3-4a467353bcc0 github.com
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