CVE-2026-55838
RustFS: Missing admin authorization on /rustfs/admin/v3/metrics allows any authenticated user to read server metrics
Description
RustFS is a distributed object storage system built in Rust. In 1.0.0-beta.7 and earlier, the real-time metrics endpoint at /rustfs/admin/v3/metrics is accessible to any valid IAM user regardless of their assigned policy. Every other admin handler in the codebase calls validate_admin_request to enforce admin-action IAM checks; the MetricsHandler skips this call entirely. A restricted IAM user whose policy grants only access to their own bucket can read server-wide operational metrics including disk I/O statistics, network throughput, scanner cycle timing, and cluster RPC state.
INFO
Published Date :
June 26, 2026, 7:57 p.m.
Last Modified :
June 26, 2026, 7:57 p.m.
Remotely Exploit :
No
Source :
GitHub_M
Affected Products
The following products are affected by CVE-2026-55838
vulnerability.
Even if cvefeed.io is aware of the exact versions of the
products
that
are
affected, the information is not represented in the table below.
No affected product recoded yet
Solution
- Integrate IAM policy checks into the MetricsHandler.
- Call validate_admin_request for all admin handlers.
- Restrict access to sensitive metrics data.
- Apply the fix in future software updates.
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CVE-2026-55838 vulnerability anywhere in the article.