What’s Vulnerable › Vulnerabilities

CVE-2026-55838: RustFS: Missing admin authorization on /rustfs/admin/v3/metrics allows any authenticated user to read server metrics

• Severity: medium (CVSS 4.3 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.3% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-06-26 · updated 2026-06-27
• Weakness: CWE-862

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.

Affected products

• rustfs: through 1.0.0-beta.7

References

• https://github.com/rustfs/rustfs/security/advisories/GHSA-f5cv-v44x-2xgf
• https://github.com/rustfs/rustfs/security/advisories/GHSA-f5cv-v44x-2xgf

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