CVE-2026-22043: Rustfs

Critical severity, CVSS 9.8. EPSS: 0.4% chance of exploitation in the next 30 days.

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 unrestricted service account, inheriting the parent’s full privileges. This enables privilege escalation and bypass of session/inline policy restrictions. Version 1.0.0-alpha.79 fixes the issue.

Affected products

• Rustfs Rustfs: version 1.0.0 only

Published 2026-01-08. Last modified 2026-06-17.