What is CVE-2026-22042?

CVE-2026-22042 is a high-severity vulnerability in Rustfs, classified under Improper Authorization. CVSS score: 8.8/10. Published 2026-01-08.

How severe is CVE-2026-22042?

High severity. CVSS v3 base score is 8.8 out of 10.

Auth bypass in Rustfs

CVE-2026-22042

RustFS is a distributed object storage system built in Rust. Prior to version 1.0.0-alpha.79, he `ImportIam` admin API validates permissions using `ExportIAMAction` instead of `ImportIAMAction`, allowing a principal with export-only IAM permissions to perform import operations. Since importing IAM data performs privileged write actions (creating/updating users, groups, policies, and service accounts), this can lead to unauthorized IAM modification and privilege escalation. Version 1.0.0-alpha.79 fixes the issue.

EPSS: 0.004 (31.8th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 8.8 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H.

Affected products

Rustfs — versions 1.0.0, < 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-2026-22042?: CVE-2026-22042 is a high-severity vulnerability in Rustfs, classified under Improper Authorization. CVSS score: 8.8/10. Published 2026-01-08.
How severe is CVE-2026-22042?: High severity. CVSS v3 base score is 8.8 out of 10.