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CVE-2026-22043

Good to know:

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Date: January 8, 2026

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.

Severity Score

Related Resources (4)

https://nvd.nist.gov/vuln/detail/CVE-2026-22043
https://github.com/rustfs/rustfs/security/advisories/GHSA-xgr5-qc6w-vcg9
https://github.com/rustfs/rustfs
https://www.mend.io/vulnerability-database/CVE-2026-22043

Severity Score

Weakness Type (CWE)

Improper Access Control

CWE-284

Improper Privilege Management

CWE-269

Insufficiently Protected Credentials

CWE-522

Top Fix

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Upgrade Version

Upgrade to version https://github.com/rustfs/rustfs.git - 1.0.0-alpha.79

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CVSS v3.1

Base Score:
Attack Vector (AV): NETWORK
Attack Complexity (AC): LOW
Privileges Required (PR): LOW
User Interaction (UI): NONE
Scope (S): UNCHANGED
Confidentiality (C): NONE
Integrity (I): HIGH
Availability (A): NONE

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