PT-2026-30978 · Rustfs · Rustfs

Published 2026-04-07 · Updated 2026-04-07 · CVE-2026-39360

Mitre

CVSS v4.0

5.3

Medium

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

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.

Fix

Missing Authorization

Weakness Enumeration

CWE-862

Related Identifiers

CVE-2026-39360

Affected Products

Rustfs

References · 2

• https://nvd.nist.gov/vuln/detail/CVE-2026-39360 · Security Note
• https://github.com/rustfs/rustfs/security/advisories/GHSA-mx42-j6wv-px98 · Note