CVE-2026-55497

MEDIUM 6.5

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

CVSS Score

6.5

EPSS Score

0.0%

EPSS Percentile

0th

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.

CWE	CWE-400 CWE-409 CWE-770
Vendor	cloudreve
Product	cloudreve
Published	Jul 31, 2026

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CVSS v3 Breakdown

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

Attack Vector

Network

Attack Complexity

Low

Privileges Required

Low

User Interaction

None

Scope

Unchanged

Confidentiality

None

Integrity

None

Availability

High

Affected Versions

cloudreve / cloudreve

< 4.17.0

References

NVD ↗ CVE.org ↗ EPSS Data ↗

github.com: https://github.com/cloudreve/cloudreve/security/advisories/GHSA-g9j2-8w95-3vwv github.com: https://github.com/cloudreve/cloudreve/commit/3607f79bb44c35d0be4fa8b6e24c0502b51415a9 github.com: https://github.com/cloudreve/cloudreve/releases/tag/4.17.0