CVE-2026-39360 MEDIUM

CVE-2026-39360: RustFS has an authorization bypass in multipart UploadPartCopy enables cross-bucket object exfiltration

Vendor Rustfs
Product rustfs
Weakness CWE-862 · Missing authorization
Published April 7, 2026
Last update April 7, 2026
View on NVD All CVEs

CVSS base score

5.3/10
Attack vector Network
Attack complexity Low
Privileges required Low
User interaction None
Confidentiality —
Integrity —

CVSS vector

CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N

What the vulnerability does

01Description

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.

Key dates

02Disclosure timeline

April 7, 2026 CVE published
April 7, 2026 Record updated

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