What is the CVSS score of CVE-2026-22043?

CVE-2026-22043 has a CVSS 3.1 base score of 9.8 (Critical). CVSS vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H. EPSS exploitation probability: 0.0%.

Which versions of Rustfs are affected by CVE-2026-22043?

Organizations using Rust. In face critical risk from CVE-2026-22043, a improper privilege management vulnerability rated CVSS 9.8.. A patch is available.

Is there a public PoC exploit available for CVE-2026-22043?

Yes, a public proof-of-concept exploit is available for CVE-2026-22043. Prioritise patching immediately. EPSS: 0.0%.

How to fix or mitigate CVE-2026-22043?

Within 24 hours: Identify all affected systems running Rust. In and apply vendor patches immediately. Monitor vendor channels for patch availability.

Rustfs CVE-2026-22043

CRITICAL

Improper Privilege Management (CWE-269)

2026-01-08 security-advisories@github.com

GHSA-xgr5-qc6w-vcg9

Privilege Escalation Rustfs

9.8

CVSS 3.1 · GitHub Advisory

Severity by source

GitHub Advisory PRIMARY

9.8 CRITICAL

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

Primary rating from GitHub Advisory · only source for this CVE.

CVSS VectorGitHub Advisory

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

Lifecycle Timeline

Patch released

Mar 31, 2026 - 21:13 nvd

Patch available

Analysis Generated

Mar 12, 2026 - 21:54 vuln.today

PoC Detected

Jan 15, 2026 - 21:13 vuln.today

Public exploit code

CVE Published

Jan 08, 2026 - 15:15 nvd

CRITICAL 9.8

DescriptionGitHub Advisory

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.

AnalysisAI

RustFS (alpha.13 to alpha.78) has a privilege escalation where restricted service accounts can self-issue unrestricted credentials by exploiting a flawed deny_only check in the IAM system. PoC available, patch available.

Technical ContextAI

The IAM system's deny_only short-circuit logic (CWE-269) incorrectly evaluates policy restrictions. A restricted service account or STS credential can create a new service account that inherits the parent's full privileges, bypassing all inline and session policy restrictions.