CVE-2026-73285

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.

CVSS v3 7.5 HIGH

7.5^/10

CVSS v3 : HIGH

Vector :

Exploitability : 1.6 / Impact : 5.9

Attack Vector NETWORK

Attack Complexity HIGH

Privileges Required LOW

User Interaction NONE

Confidentiality Impact HIGH

Integrity Impact HIGH

Availability Impact HIGH

Scope UNCHANGED

References

Link	Resource
https://github.com/rustfs/rustfs/blob/380ed40b471887014fe21d069b61df9eacca074b/.agents/skills/security-advisory-lessons/references/advisory-patterns.md?plain=1#L47
https://github.com/rustfs/rustfs/commit/98d3619613722308498494d412797a52ea8ae64d
https://github.com/rustfs/rustfs/releases/tag/1.0.0-rc.1
https://github.com/rustfs/rustfs/security/advisories/GHSA-5w8r-p896-6vq2
https://github.com/rustfs/rustfs/security/advisories/GHSA-5w8r-p896-6vq2

Configurations

No configuration.

History

No history.

Information

Published : 2026-08-12 15:18

Updated : 2026-09-09 20:55

NVD link : CVE-2026-73285

Mitre link : CVE-2026-73285

CVE.ORG link : CVE-2026-73285

JSON object : View

Products Affected

No product.

CWE

CWE-863

Incorrect Authorization

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