CVE-2026-55497

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

Published Jul 31, 2026 CVSS 3.1 · 6.5 Medium EPSS < 1% KEV · Not listed
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.

Remediation

No solution or workaround provided in the CVE record

Tracking

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Advisories

Source ID Title
Github GHSA Github GHSA GHSA-g9j2-8w95-3vwv Cloudreve: Denial of Service - Image decompression / pixel bomb in thumbnail & avatar decoding crashes the server
History
Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'poc', 'Technical Impact': 'partial'}, 'version': '2.0.3'}

Type Values Removed Values Added
First Time appeared Cloudreve
Cloudreve cloudreve
Vendors & Products Cloudreve
Cloudreve cloudreve
Type Values Removed Values Added
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.
Title Cloudreve: Server crash through image decompression/pixel bomb in thumbnail & avatar decoding (DoS)
Weaknesses CWE-400
CWE-409
CWE-770
References
Metrics cvssV3_1

{'score': 6.5, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H'}

Weaknesses

Sources

Status
PUBLISHED
Assigner
GitHub_M
Published
Updated
Jul 31, 2026, 3:58 PM
Reserved
Jun 16, 2026, 10:28 PM
Status
Deferred
Published
Jul 31, 2026, 4:17 AM
Modified
Sep 8, 2026, 8:51 PM