CVE-2026-39360

RustFS is a distributed object storage system built in Rust. Prior to alpha.90, RustFS contains a missing authorization check in the multipart copy path (UploadPartCopy). A low-privileged user who cannot read objects from a victim bucket can still exfiltrate victim objects by copying them into an attacker-controlled multipart upload and completing the upload. This breaks tenant isolation in multi-user / multi-tenant deployments. This vulnerability is fixed in alpha.90.

Score
CVSS 4.0 5.3 Medium
Status
Analyzed - security-advisories@github.com
Published
2026-04-07
Last modified
2026-04-07
Weaknesses
CWE-862

Affected products

References

 
 
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