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

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-73285
StatePUBLISHED
AssignerGitHub_M
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-08-12 15:18:31 UTC
Updated2026-08-12 15:18:31 UTC
DescriptionRustFS 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.

Risk And Classification

Primary CVSS: v3.1 7.5 HIGH from [email protected]

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

EPSS: 0.003460000 probability, percentile 0.274370000 (date 2026-08-13)

Problem Types: CWE-863 | CWE-863 CWE-863: Incorrect Authorization

VersionSourceTypeScoreSeverityVector
3.1[email protected]Secondary7.5HIGHCVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H
3.1CNADECLARED7.5HIGHCVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H

CVSS v3.1 Breakdown

Attack Vector
Network
Attack Complexity
High
Privileges Required
Low
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High

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

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Rustfs Rustfs affected >= 1.0.0-alpha.64, < 1.0.0-rc.1 Not specified

References

ReferenceSourceLinkTags
github.com/rustfs/rustfs/blob/380ed40b471887014fe21d069b61df9eacca074b/.... [email protected] github.com
github.com/rustfs/rustfs/releases/tag/1.0.0-rc.1 [email protected] github.com
github.com/rustfs/rustfs/commit/98d3619613722308498494d412797a52ea8ae64d [email protected] github.com
github.com/rustfs/rustfs/security/advisories/GHSA-5w8r-p896-6vq2 134c704f-9b21-4f2e-91b3-4a467353bcc0 github.com
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