CVE-2026-39360
MediumCVSS 4.3Exploitation Probability (EPSS)
Low risk10th percentile - higher than 10% of all known CVEs
Summary
RustFS is a distributed object storage system where prior to alpha.90, there is a missing authorization check in the multipart copy path (UploadPartCopy). A low-privileged user who cannot read objects from a victim bucket can copy victim objects into an attacker-controlled multipart upload and complete the upload.
Risk Assessment
This breaks tenant isolation in multi-user/multi-tenant deployments, allowing data leakage between tenants.
Recommendation
Immediately update RustFS to version alpha.90 or later, which includes the fix.
Original NVD description (English source)
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.