CVE-2026-55497CWE-400CWE-409CWE-770denial-of-service

CVE-2026-55497

Medium · published July 31, 2026

CVSS v3.1
6.5
EPSS
1%
Percentile
44.0
In the wild
Unconfirmed
What it is

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.

The record
Technical detail
CVSS v3.1
6.5 · MEDIUM
Vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
CVSS v4.0
Not supplied
EPSS
0.00530 · 44.0th percentile
Weaknesses
CWE-400 · Uncontrolled Resource Consumption; CWE-409 · Improper Handling of Highly Compressed Data (Data Amplification); CWE-770 · Allocation of Resources Without Limits or Throttling
Published
2026-07-31T08:17Z
References (4)
https://github.com/cloudreve/cloudreve/commit/3607f79bb44c35d0be4fa8b6e24c0502b51415a9 · [email protected]https://github.com/cloudreve/cloudreve/releases/tag/4.17.0 · [email protected]https://github.com/cloudreve/cloudreve/security/advisories/GHSA-g9j2-8w95-3vwv · [email protected]https://github.com/cloudreve/cloudreve/security/advisories/GHSA-g9j2-8w95-3vwv · 134c704f-9b21-4f2e-91b3-4a467353bcc0
EPSS history
Timeline
  • 31 JUL 03:28Z
    Cloudreve: Server crash through image decompression/pixel bomb in thumbnail & avatar decoding (DoS)
    cvelistv5