What’s Vulnerable › Vulnerabilities
CVE-2026-39360: RustFS has an authorization bypass in multipart UploadPartCopy enables cross-bucket object exfiltration
- Severity: medium (CVSS 4.3 v3.1)
- Exploited in the wild: not listed in CISA KEV
- EPSS: 0.2% probability of exploitation in the next 30 days
- Public exploit or detection template: yes
- Published: 2026-04-07 · updated 2026-07-24
- Weakness: CWE-862
Description
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 products
- rustfs: 1.0.0-alpha1, 1.0.0-alpha10, 1.0.0-alpha11, 1.0.0-alpha12, 1.0.0-alpha13, 1.0.0-alpha14 (+83)
References
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