CVE-2026-73285

HIGH

RustFS: OPA policy plugin omits ExistingObjectTag conditions, allowing tag-based authorization policies to treat tagged objects as untagged

Title source: CVE List
STIX 2.1 vulnerability

Record summary

CVE-2026-73285 has a selected CVSS score of 7.5 (high).

Description

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.

Description source: CVE List

Exploitation context

CISA SSVC decision

ExploitationNone
AutomatableNo
Technical impactTotal

CISA Coordinator · SSVC 2.0.3 · Evaluated Aug 12, 2026 · Source: CVE List

Affected products and versions

1
ProductSourceVersion range

rustfs

Browse rustfs / rustfs
CVE List>= 1.0.0-alpha.64, < 1.0.0-rc.1affected

References

4