What is CVE-2026-55838?

CVE-2026-55838 is a medium-severity vulnerability in Rustfs, classified under Missing Authorization. CVSS score: 4.3/10. Published 2026-06-26.

How severe is CVE-2026-55838?

Medium severity. CVSS v3 base score is 4.3 out of 10.

Auth bypass in Rustfs

CVE-2026-55838

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…

Vulnerability class: Broken Access Control

CVSS v3 metric

CVSS v3 base score 4.3 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N.

Affected products

Rustfs — versions <= 1.0.0-beta.7

Weakness classification (CWE)

CWE-862 — Missing Authorization

References

security-advisories@github.com (x_refsource_CONFIRM)

Frequently asked questions

What is CVE-2026-55838?: CVE-2026-55838 is a medium-severity vulnerability in Rustfs, classified under Missing Authorization. CVSS score: 4.3/10. Published 2026-06-26.
How severe is CVE-2026-55838?: Medium severity. CVSS v3 base score is 4.3 out of 10.