CVE-2026-73285: Rustfs

High severity, CVSS 7.5. EPSS: 0.5% chance of exploitation in the next 30 days.

RustFS is a distributed object storage system built in Rust. From 1.0.0-alpha.64 until 1.0.0-rc.1, RustFS external OPA authorization enabled by RUSTFS_POLICY_PLUGIN_URL in crates/iam/src/sys.rs sets PreparedIamAuth.needs_existing_object_tag incorrectly for PreparedIamMode::Opa, causing maybe_merge_object_tag_conditions to omit s3:ExistingObjectTag/* values and allowing authenticated users to bypass tag-based policy restrictions. This issue is fixed in version 1.0.0-rc.1.

Affected products

• Rustfs Rustfs: from 1.0.0-alpha.64, before 1.0.0-rc.1 (fixed in 1.0.0-rc.1)

Published 2026-08-12. Last modified 2026-09-09.