What is CVE-2026-55497?

CVE-2026-55497 is a medium-severity vulnerability in Cloudreve, classified under Uncontrolled Resource Consumption. CVSS score: 6.5/10. Published 2026-07-31.

How severe is CVE-2026-55497?

Medium severity. CVSS v3 base score is 6.5 out of 10.

Resource exhaustion in Cloudreve

CVE-2026-55497

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.

Vulnerability class: DoS (Denial of Service)

EPSS: 0.003 (22.0th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 6.5 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H.

Affected products

Cloudreve — versions < 4.17.0

Weakness classification (CWE)

References

security-advisories@github.com (x_refsource_MISC)
security-advisories@github.com (x_refsource_MISC)
security-advisories@github.com (x_refsource_CONFIRM)

Frequently asked questions

What is CVE-2026-55497?: CVE-2026-55497 is a medium-severity vulnerability in Cloudreve, classified under Uncontrolled Resource Consumption. CVSS score: 6.5/10. Published 2026-07-31.
How severe is CVE-2026-55497?: Medium severity. CVSS v3 base score is 6.5 out of 10.