CVE-2026-22043

high-risk

Published 2026-01-08

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.

Do I need to act?

0.02% chance of exploitation

EPSS score — low exploit probability

Not on CISA KEV list

No confirmed active exploitation reported to CISA

Fix available

Upgrade to: a95e549430851f3c34ee4cc8dd7be60aa200e8c4

CVSS 9.8/10 Critical

NETWORK / LOW complexity

Affected Products (20)

Rustfs

Affected Vendors

Rustfs

References (2)

Exploit https://github.com/rustfs/rustfs/security/advisories/GHSA-xgr5-qc6w-vcg9

/ 100

high-risk

Severity 32/34 · Critical

Exploitability 0/34 · Minimal

Exposure 27/34 · High