CVE-2026-22043 — CRITICAL (9.8)

Vulnerability Description

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.

CVSS Score

9.8

CRITICAL

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Attack Vector

NETWORK

Attack Complexity

LOW

Privileges Required

NONE

User Interaction

NONE

Scope

UNCHANGED

Confidentiality

HIGH

Integrity

HIGH

Availability

HIGH

Affected Products

Vendor	Product	Versions
Rustfs	Rustfs	1.0.0

Related Weaknesses (CWE)

CWE-522 CWE-269 CWE-284

References

https://github.com/rustfs/rustfs/security/advisories/GHSA-xgr5-qc6w-vcg9ExploitVendor Advisory
https://github.com/rustfs/rustfs/security/advisories/GHSA-xgr5-qc6w-vcg9ExploitVendor Advisory

FAQ

What is CVE-2026-22043?

CVE-2026-22043 is a vulnerability with a CVSS score of 9.8 (CRITICAL). 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 ...

How severe is CVE-2026-22043?

CVE-2026-22043 has been rated CRITICAL with a CVSS base score of 9.8/10. This is considered a critical vulnerability requiring immediate attention.

Is there a patch for CVE-2026-22043?

Check the references section above for vendor advisories and patch information. Affected products include: Rustfs Rustfs.