Moderate severityNVD Advisory· Published Jul 31, 2026· Updated Jul 31, 2026
Cloudreve: Server crash through image decompression/pixel bomb in thumbnail & avatar decoding (DoS)
CVE-2026-55497
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.
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Affected packages
Versions sourced from the GitHub Security Advisory.
| Package | Affected versions | Patched versions |
|---|---|---|
github.com/cloudreve/Cloudreve/v4Go | < 4.0.0-20260613024411-3607f79bb44c | 4.0.0-20260613024411-3607f79bb44c |
github.com/cloudreve/Cloudreve/v3Go | <= 3.0.0-20250225100611-da4e44b77af4 | — |
Affected products
1Patches
Vulnerability mechanics
References
4- github.com/advisories/GHSA-g9j2-8w95-3vwvghsaADVISORY
- github.com/cloudreve/cloudreve/commit/3607f79bb44c35d0be4fa8b6e24c0502b51415a9ghsax_refsource_MISCWEB
- github.com/cloudreve/cloudreve/releases/tag/4.17.0ghsax_refsource_MISCWEB
- github.com/cloudreve/cloudreve/security/advisories/GHSA-g9j2-8w95-3vwvghsax_refsource_CONFIRMWEB
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