CVE-2026-39360 | THREATINT

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.

PUBLISHED Reserved 2026-04-06 | Published 2026-04-07 | Updated 2026-04-07 | Assigner GitHub_M

MEDIUM: 5.3CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N

Problem types

CWE-862: Missing Authorization

Product status

< alpha.90

affected

References

github.com/...rustfs/security/advisories/GHSA-mx42-j6wv-px98

cve.org (CVE-2026-39360)

nvd.nist.gov (CVE-2026-39360)

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