CVE-2026-73285 Missing authorization in rustfs
Authenticated users can bypass tag-based policy restrictions in RustFS when OPA authorization is enabled, due to omitted object tag conditions.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-73285?
CVE-2026-73285 is a high-severity missing authorization vulnerability in rustfs, published on 12 Aug 2026. Any signed-in user can exploit it over the network, with no action from the victim.
Official 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.
Weakness: CWE-863
Which versions are affected by CVE-2026-73285?
How do I fix CVE-2026-73285?
No fix has been published for CVE-2026-73285 yet. Limit exposure of the affected software until one is available.
Upgrade, and check permissions on every request on the server, not only in the interface. More about Missing authorization.
Is CVE-2026-73285 being exploited?
There is no known exploitation of CVE-2026-73285 in the wild and no public exploit code.
Sources
Also known as GHSA-5w8r-p896-6vq2.