CVE-2026-55188: Rustfs

High severity, CVSS 8.2. EPSS: 0.3% chance of exploitation in the next 30 days.

RustFS is a distributed object storage system built in Rust. From 1.0.0-alpha.1 until 1.0.0-beta.9, RustFS contains an authorization bypass in the bucket replication admin API. The ListRemoteTargetHandler handler for listing remote replication targets only checks whether request credentials exist, but does not verify that the caller has replication or administrator permissions. As a result, an authenticated user with no effective bucket or admin permissions can list remote replication target configuration for a bucket. Because the returned BucketTarget objects include remote target credentials, this can disclose replication access keys and secret keys. This vulnerability is fixed in 1.0.0-beta.9.

Affected products

• Rustfs Rustfs: from 1.0.0-alpha.1, up to and including 1.0.0-beta.8

Published 2026-06-26. Last modified 2026-06-27.