What’s Vulnerable › Vulnerabilities

CVE-2026-55497: Cloudreve: Server crash through image decompression/pixel bomb in thumbnail & avatar decoding (DoS)

• Severity: medium (CVSS 6.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.5% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-07-31 · updated 2026-09-08
• Weakness: CWE-400

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 products

• cloudreve: before 4.17.0

References

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

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