CVE-2026-39360
Medium · 4.3CVSS
4.3
EPSS
0.3%
Published
Apr 7, 2026
CISA due date
—
The record
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.
Affected packages
| Ecosystem | Package | Introduced | Fixed |
|---|---|---|---|
| crates.io | rustfs | 0 | No fix |
Related vulnerabilities
- GHSA-mx42-j6wv-px98 RustFS has an authorization bypass in multipart UploadPartCopy enables cross-bucket… Same vulnerability
- GHSA-mm2q-qcmx-gw4w RustFS: ListServiceAccount authorizes against wrong admin action, enabling cross-user… Also affects rustfs
- CVE-2026-40937 RustFS is a distributed object storage system built in Rust. Also affects rustfs
- GHSA-pfcq-4gjr-6gjm RustFS: Missing admin authorization on notification target endpoints allows… Also affects rustfs
- GHSA-v9fg-3cr2-277j Rust has Critical Stored XSS in Preview Modal, leading to Administrative Account Takeover Also affects rustfs
- GHSA-w5fh-f8xh-5x3p RustFS: Missing Post Policy Validation leads to Arbitrary Object Write Also affects rustfs
- CVE-2026-27822 RustFS is a distributed object storage system built in Rust. Also affects rustfs
- CVE-2026-27607 RustFS is a distributed object storage system built in Rust. Also affects rustfs