9.8
CRITICAL CVSS 3.1
CVE-2026-22043
RustFS has IAM deny_only Short-Circuit that Allows Privilege Escalation via Service Account Minting
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.

INFO

Published Date :

Jan. 8, 2026, 3:15 p.m.

Last Modified :

Jan. 15, 2026, 9:13 p.m.

Remotely Exploit :

Yes !
Affected Products

The following products are affected by CVE-2026-22043 vulnerability. Even if cvefeed.io is aware of the exact versions of the products that are affected, the information is not represented in the table below.

ID Vendor Product Action
1 Rustfs rustfs
CVSS Scores
The Common Vulnerability Scoring System is a standardized framework for assessing the severity of vulnerabilities in software and systems. We collect and displays CVSS scores from various sources for each CVE.
Score Version Severity Vector Exploitability Score Impact Score Source
CVSS 3.1 CRITICAL [email protected]
CVSS 4.0 MEDIUM [email protected]
Solution
Update RustFS to version 1.0.0-alpha.79 to fix privilege escalation vulnerability.
  • Update RustFS to version 1.0.0-alpha.79.
  • Review and re-apply IAM policies.
  • Audit existing service account permissions.
References to Advisories, Solutions, and Tools

Here, you will find a curated list of external links that provide in-depth information, practical solutions, and valuable tools related to CVE-2026-22043.

URL Resource
https://github.com/rustfs/rustfs/security/advisories/GHSA-xgr5-qc6w-vcg9 Exploit Vendor Advisory
https://github.com/rustfs/rustfs/security/advisories/GHSA-xgr5-qc6w-vcg9 Exploit Vendor Advisory
CWE - Common Weakness Enumeration

While CVE identifies specific instances of vulnerabilities, CWE categorizes the common flaws or weaknesses that can lead to vulnerabilities. CVE-2026-22043 is associated with the following CWEs:

Common Attack Pattern Enumeration and Classification (CAPEC)

Common Attack Pattern Enumeration and Classification (CAPEC) stores attack patterns, which are descriptions of the common attributes and approaches employed by adversaries to exploit the CVE-2026-22043 weaknesses.

CAPEC-58: Restful Privilege Elevation Restful Privilege Elevation CAPEC-122: Privilege Abuse Privilege Abuse CAPEC-233: Privilege Escalation Privilege Escalation CAPEC-19: Embedding Scripts within Scripts Embedding Scripts within Scripts CAPEC-441: Malicious Logic Insertion Malicious Logic Insertion CAPEC-478: Modification of Windows Service Configuration Modification of Windows Service Configuration CAPEC-479: Malicious Root Certificate Malicious Root Certificate CAPEC-502: Intent Spoof Intent Spoof CAPEC-503: WebView Exposure WebView Exposure CAPEC-536: Data Injected During Configuration Data Injected During Configuration CAPEC-546: Incomplete Data Deletion in a Multi-Tenant Environment Incomplete Data Deletion in a Multi-Tenant Environment CAPEC-550: Install New Service Install New Service CAPEC-551: Modify Existing Service Modify Existing Service CAPEC-552: Install Rootkit Install Rootkit CAPEC-556: Replace File Extension Handlers Replace File Extension Handlers CAPEC-558: Replace Trusted Executable Replace Trusted Executable CAPEC-562: Modify Shared File Modify Shared File CAPEC-563: Add Malicious File to Shared Webroot Add Malicious File to Shared Webroot CAPEC-564: Run Software at Logon Run Software at Logon CAPEC-578: Disable Security Software Disable Security Software CAPEC-50: Password Recovery Exploitation Password Recovery Exploitation CAPEC-102: Session Sidejacking Session Sidejacking CAPEC-474: Signature Spoofing by Key Theft Signature Spoofing by Key Theft CAPEC-509: Kerberoasting Kerberoasting CAPEC-551: Modify Existing Service Modify Existing Service CAPEC-555: Remote Services with Stolen Credentials Remote Services with Stolen Credentials CAPEC-560: Use of Known Domain Credentials Use of Known Domain Credentials CAPEC-561: Windows Admin Shares with Stolen Credentials Windows Admin Shares with Stolen Credentials CAPEC-600: Credential Stuffing Credential Stuffing CAPEC-644: Use of Captured Hashes (Pass The Hash) Use of Captured Hashes (Pass The Hash) CAPEC-645: Use of Captured Tickets (Pass The Ticket) Use of Captured Tickets (Pass The Ticket) CAPEC-652: Use of Known Kerberos Credentials Use of Known Kerberos Credentials CAPEC-653: Use of Known Operating System Credentials Use of Known Operating System Credentials

We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).

Results are limited to the first 15 repositories due to potential performance issues.

The following list is the news that have been mention CVE-2026-22043 vulnerability anywhere in the article.

The following table lists the changes that have been made to the CVE-2026-22043 vulnerability over time.

Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.

  • Initial Analysis by [email protected]

    Jan. 15, 2026

    Action Type Old Value New Value
    Added CVSS V3.1 AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
    Added CWE CWE-522
    Added CPE Configuration OR *cpe:2.3:a:rustfs:rustfs:1.0.0:alpha13:*:*:*:rust:*:* *cpe:2.3:a:rustfs:rustfs:1.0.0:alpha14:*:*:*:rust:*:* *cpe:2.3:a:rustfs:rustfs:1.0.0:alpha15:*:*:*:rust:*:* *cpe:2.3:a:rustfs:rustfs:1.0.0:alpha16:*:*:*:rust:*:* *cpe:2.3:a:rustfs:rustfs:1.0.0:alpha17:*:*:*:rust:*:* *cpe:2.3:a:rustfs:rustfs:1.0.0:alpha18:*:*:*:rust:*:* *cpe:2.3:a:rustfs:rustfs:1.0.0:alpha19:*:*:*:rust:*:* *cpe:2.3:a:rustfs:rustfs:1.0.0:alpha20:*:*:*:rust:*:* *cpe:2.3:a:rustfs:rustfs:1.0.0:alpha21:*:*:*:rust:*:* *cpe:2.3:a:rustfs:rustfs:1.0.0:alpha22:*:*:*:rust:*:* *cpe:2.3:a:rustfs:rustfs:1.0.0:alpha23:*:*:*:rust:*:* *cpe:2.3:a:rustfs:rustfs:1.0.0:alpha24:*:*:*:rust:*:* *cpe:2.3:a:rustfs:rustfs:1.0.0:alpha25:*:*:*:rust:*:* *cpe:2.3:a:rustfs:rustfs:1.0.0:alpha26:*:*:*:rust:*:* *cpe:2.3:a:rustfs:rustfs:1.0.0:alpha27:*:*:*:rust:*:* *cpe:2.3:a:rustfs:rustfs:1.0.0:alpha28:*:*:*:rust:*:* *cpe:2.3:a:rustfs:rustfs:1.0.0:alpha29:*:*:*:rust:*:* *cpe:2.3:a:rustfs:rustfs:1.0.0:alpha30:*:*:*:rust:*:* *cpe:2.3:a:rustfs:rustfs:1.0.0:alpha31:*:*:*:rust:*:* *cpe:2.3:a:rustfs:rustfs:1.0.0:alpha32:*:*:*:rust:*:* *cpe:2.3:a:rustfs:rustfs:1.0.0:alpha33:*:*:*:rust:*:* *cpe:2.3:a:rustfs:rustfs:1.0.0:alpha34:*:*:*:rust:*:* *cpe:2.3:a:rustfs:rustfs:1.0.0:alpha35:*:*:*:rust:*:* *cpe:2.3:a:rustfs:rustfs:1.0.0:alpha36:*:*:*:rust:*:* *cpe:2.3:a:rustfs:rustfs:1.0.0:alpha37:*:*:*:rust:*:* *cpe:2.3:a:rustfs:rustfs:1.0.0:alpha38:*:*:*:rust:*:* *cpe:2.3:a:rustfs:rustfs:1.0.0:alpha39:*:*:*:rust:*:* *cpe:2.3:a:rustfs:rustfs:1.0.0:alpha40:*:*:*:rust:*:* *cpe:2.3:a:rustfs:rustfs:1.0.0:alpha41:*:*:*:rust:*:* *cpe:2.3:a:rustfs:rustfs:1.0.0:alpha42:*:*:*:rust:*:* *cpe:2.3:a:rustfs:rustfs:1.0.0:alpha43:*:*:*:rust:*:* *cpe:2.3:a:rustfs:rustfs:1.0.0:alpha44:*:*:*:rust:*:* *cpe:2.3:a:rustfs:rustfs:1.0.0:alpha45:*:*:*:rust:*:* *cpe:2.3:a:rustfs:rustfs:1.0.0:alpha46:*:*:*:rust:*:* *cpe:2.3:a:rustfs:rustfs:1.0.0:alpha47:*:*:*:rust:*:* *cpe:2.3:a:rustfs:rustfs:1.0.0:alpha48:*:*:*:rust:*:* *cpe:2.3:a:rustfs:rustfs:1.0.0:alpha49:*:*:*:rust:*:* *cpe:2.3:a:rustfs:rustfs:1.0.0:alpha50:*:*:*:rust:*:* *cpe:2.3:a:rustfs:rustfs:1.0.0:alpha51:*:*:*:rust:*:* *cpe:2.3:a:rustfs:rustfs:1.0.0:alpha52:*:*:*:rust:*:* *cpe:2.3:a:rustfs:rustfs:1.0.0:alpha53:*:*:*:rust:*:* *cpe:2.3:a:rustfs:rustfs:1.0.0:alpha54:*:*:*:rust:*:* *cpe:2.3:a:rustfs:rustfs:1.0.0:alpha55:*:*:*:rust:*:* *cpe:2.3:a:rustfs:rustfs:1.0.0:alpha56:*:*:*:rust:*:* *cpe:2.3:a:rustfs:rustfs:1.0.0:alpha57:*:*:*:rust:*:* *cpe:2.3:a:rustfs:rustfs:1.0.0:alpha58:*:*:*:rust:*:* *cpe:2.3:a:rustfs:rustfs:1.0.0:alpha59:*:*:*:rust:*:* *cpe:2.3:a:rustfs:rustfs:1.0.0:alpha60:*:*:*:rust:*:* *cpe:2.3:a:rustfs:rustfs:1.0.0:alpha61:*:*:*:rust:*:* *cpe:2.3:a:rustfs:rustfs:1.0.0:alpha62:*:*:*:rust:*:* *cpe:2.3:a:rustfs:rustfs:1.0.0:alpha63:*:*:*:rust:*:* *cpe:2.3:a:rustfs:rustfs:1.0.0:alpha64:*:*:*:rust:*:* *cpe:2.3:a:rustfs:rustfs:1.0.0:alpha65:*:*:*:rust:*:* *cpe:2.3:a:rustfs:rustfs:1.0.0:alpha66:*:*:*:rust:*:* *cpe:2.3:a:rustfs:rustfs:1.0.0:alpha67:*:*:*:rust:*:* *cpe:2.3:a:rustfs:rustfs:1.0.0:alpha68:*:*:*:rust:*:* *cpe:2.3:a:rustfs:rustfs:1.0.0:alpha69:*:*:*:rust:*:* *cpe:2.3:a:rustfs:rustfs:1.0.0:alpha70:*:*:*:rust:*:* *cpe:2.3:a:rustfs:rustfs:1.0.0:alpha71:*:*:*:rust:*:* *cpe:2.3:a:rustfs:rustfs:1.0.0:alpha72:*:*:*:rust:*:* *cpe:2.3:a:rustfs:rustfs:1.0.0:alpha73:*:*:*:rust:*:* *cpe:2.3:a:rustfs:rustfs:1.0.0:alpha74:*:*:*:rust:*:* *cpe:2.3:a:rustfs:rustfs:1.0.0:alpha75:*:*:*:rust:*:* *cpe:2.3:a:rustfs:rustfs:1.0.0:alpha76:*:*:*:rust:*:* *cpe:2.3:a:rustfs:rustfs:1.0.0:alpha77:*:*:*:rust:*:* *cpe:2.3:a:rustfs:rustfs:1.0.0:alpha78:*:*:*:rust:*:*
    Added Reference Type CISA-ADP: https://github.com/rustfs/rustfs/security/advisories/GHSA-xgr5-qc6w-vcg9 Types: Exploit, Vendor Advisory
    Added Reference Type GitHub, Inc.: https://github.com/rustfs/rustfs/security/advisories/GHSA-xgr5-qc6w-vcg9 Types: Exploit, Vendor Advisory
  • CVE Modified by 134c704f-9b21-4f2e-91b3-4a467353bcc0

    Jan. 08, 2026

    Action Type Old Value New Value
    Added Reference https://github.com/rustfs/rustfs/security/advisories/GHSA-xgr5-qc6w-vcg9
  • New CVE Received by [email protected]

    Jan. 08, 2026

    Action Type Old Value New Value
    Added 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.
    Added CVSS V4.0 AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N/E:P/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
    Added CWE CWE-284
    Added CWE CWE-269
    Added Reference https://github.com/rustfs/rustfs/security/advisories/GHSA-xgr5-qc6w-vcg9
EPSS is a daily estimate of the probability of exploitation activity being observed over the next 30 days. Following chart shows the EPSS score history of the vulnerability.
Vulnerability Scoring Details
Base CVSS Score: 5.7
Attack Vector
Attack Complexity
Attack Requirements
Privileges Required
User Interaction
VS Confidentiality
VS Integrity
VS Availability
SS Confidentiality
SS Integrity
SS Availability
Base CVSS Score: 9.8
Attack Vector
Attack Complexity
Privileges Required
User Interaction
Scope
Confidentiality Impact
Integrity Impact
Availability Impact