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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
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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

4
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.

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Attack ChainAIDerived

Hypothetical attack flow derived from CVE metadata

Access
Obtain restricted service account credentials
Delivery
Call IAM self-issuance endpoint
Exploit
Exploit deny_only short-circuit logic
Execution
Generate unrestricted service account token
Impact
Access all parent account resources
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Vulnerability AssessmentAI

Exploitation RustFS versions 1.0.0-alpha.13 through alpha.78 with IAM enabled. … Additional conditions and limiting factors are described in the full assessment.
Risk Assessment CVSS 9.8 (Critical). … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in.
Exploit Scenario An attacker compromises a restricted RustFS service account intended only for read access to a single bucket. They exploit the deny_only bypass to create a new unrestricted service account with full admin privileges, accessing all buckets and administrative functions.
Remediation Update to RustFS 1.0.0-alpha.79 or later. … Detailed patch versions, workarounds, and compensating controls in full report.
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Within 24 hours: Identify all affected systems running Rust. …

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CVE-2026-22043 vulnerability details – vuln.today
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