CVE-2026-73285

Published: Aug 12, 2026Modified: Aug 12, 2026

7.5

Vector

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

Exploitability: 1.6 / Impact: 5.9

Source: security-advisories@github.com (Secondary)

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.

Related CWEs

CWE-863

Incorrect Authorization

The product performs an authorization check when an actor attempts to access a resource or perform an action, but it does not correctly perform the check. This allows attackers to bypass intended access restrictions.

References (5)

https://github.com/rustfs/rustfs/blob/380ed40b471887014fe21d069b61df9eacca074b/.agents/skills/security-advisory-lessons/references/advisory-patterns.md?plain=1#L47

Source: security-advisories@github.com

https://github.com/rustfs/rustfs/commit/98d3619613722308498494d412797a52ea8ae64d

Source: security-advisories@github.com

https://github.com/rustfs/rustfs/releases/tag/1.0.0-rc.1

Source: security-advisories@github.com

https://github.com/rustfs/rustfs/security/advisories/GHSA-5w8r-p896-6vq2

Source: security-advisories@github.com

https://github.com/rustfs/rustfs/security/advisories/GHSA-5w8r-p896-6vq2

Source: 134c704f-9b21-4f2e-91b3-4a467353bcc0

Timeline

No history available yet.