CVE-2026-39360

MEDIUM

4.3

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.

CVE Details

CVSS v3.1 Score4.3

SeverityMEDIUM

CVSS VectorCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N

Attack VectorNETWORK

ComplexityLOW

Privileges RequiredLOW

User InteractionNONE

Published4/7/2026

Last Modified4/10/2026

Sourcenvd

Honeypot Sightings0

Affected Products

rustfs:rustfs

Weaknesses (CWE)

CWE-862

References

https://github.com/rustfs/rustfs/security/advisories/GHSA-mx42-j6wv-px98(security-advisories@github.com)

IOC Correlations

No correlations recorded

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