CVE-2026-39360
RustFS has an authorization bypass in multipart UploadPartCopy enables cross-bucket object exfiltration
CVSS Score
0.0
EPSS Score
0.0%
EPSS Percentile
0th
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.
| CWE | CWE-862 |
| Vendor | rustfs |
| Product | rustfs |
| Published | Apr 7, 2026 |
| Last Updated | Apr 7, 2026 |
Stay Ahead of the Next One
Get instant alerts for rustfs rustfs
Be the first to know when new unknown vulnerabilities affecting rustfs rustfs are published — delivered to Slack, Telegram or Discord.
Get Free Alerts →
Free · No credit card · 60 sec setup
Affected Versions
rustfs / rustfs
< alpha.90