What is CVE-2026-22043?

CVE-2026-22043 is a critical-severity vulnerability in Rustfs, classified under Improper Privilege Management. CVSS score: 9.8/10. Published 2026-01-08.

How severe is CVE-2026-22043?

Critical severity. CVSS v3 base score is 9.8 out of 10.

Privilege escalation in Rustfs

CVE-2026-22043

RustFS is a distributed object storage system built in Rust. In versions 1.0.0-alpha.13 through 1.0.0-alpha.78, a flawed `deny_only` short-circuit in RustFS IAM allows a restricted service account or STS credential to self-issue an unrestr…

Vulnerability class: Privilege Escalation

EPSS: 0.004 (29.6th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 9.8 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.

Affected products

Rustfs — versions 1.0.0, >= 1.0.0-alpha.13, < 1.0.0-alpha.79

Weakness classification (CWE)

References

security-advisories@github.com (x_refsource_CONFIRM, Exploit, Vendor Advisory)

Frequently asked questions

What is CVE-2026-22043?: CVE-2026-22043 is a critical-severity vulnerability in Rustfs, classified under Improper Privilege Management. CVSS score: 9.8/10. Published 2026-01-08.
How severe is CVE-2026-22043?: Critical severity. CVSS v3 base score is 9.8 out of 10.