Is CVE-2026-55838 being exploited?

No public exploit is currently tracked.

How severe is CVE-2026-55838?

CVE-2026-55838 has a CVSS v3 severity of MEDIUM (4.3).

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CVE-2026-55838

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.