Vulnerability · Published Jul 31, 2026 · Assigned by GitHub_M
CVE-2026-55497Cloudreve: Server crash through image decompression/pixel bomb in thumbnail & avatar decoding (DoS)
Medium 6.5
In plain English
A medium-severity uncontrolled resource consumption in cloudreve from cloudreve. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 0.5% (higher than 45% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.
Official 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.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| Go | github.com/cloudreve/Cloudreve | no fix listed | GO-2026-6100 |
| Go | github.com/cloudreve/Cloudreve/v3 | no fix listed | GHSA-g9j2-8w95-3vwv |
| Go | github.com/cloudreve/Cloudreve/v3 | no fix listed | GO-2026-6100 |
| Go | github.com/cloudreve/Cloudreve/v4 | 4.0.0-20260613024411-3607f79bb44c | GHSA-g9j2-8w95-3vwv |
| Go | github.com/cloudreve/Cloudreve/v4 | 4.0.0-20260613024411-3607f79bb44c | GO-2026-6100 |
Affected products (as reported)
Weakness: CWE-400, CWE-409, CWE-770 · Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H