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Rustfs CVE-2026-22042

HIGH
Improper Authorization (CWE-285)
2026-01-08 security-advisories@github.com GHSA-vcwh-pff9-64cc
Privilege Escalation Rustfs
8.8
CVSS 3.1 · GitHub Advisory
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Severity by source

GitHub Advisory PRIMARY
8.8 HIGH
AV:N/AC:L/PR:L/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:L/UI:N/S:U/C:H/I:H/A:H
Attack Vector
Network
Attack Complexity
Low
Privileges Required
Low
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 - 21:11 vuln.today
Public exploit code
CVE Published
Jan 08, 2026 - 15:15 nvd
HIGH 8.8

DescriptionGitHub Advisory

RustFS is a distributed object storage system built in Rust. Prior to version 1.0.0-alpha.79, he ImportIam admin API validates permissions using ExportIAMAction instead of ImportIAMAction, allowing a principal with export-only IAM permissions to perform import operations. Since importing IAM data performs privileged write actions (creating/updating users, groups, policies, and service accounts), this can lead to unauthorized IAM modification and privilege escalation. Version 1.0.0-alpha.79 fixes the issue.

AnalysisAI

Incorrect IAM permission validation in RustFS prior to version 1.0.0-alpha.79 permits principals with export-only permissions to execute import operations, enabling unauthorized modification of users, groups, policies, and service accounts. Public exploit code exists for this vulnerability, and authenticated attackers can escalate privileges through malicious IAM imports. …

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Attack ChainAIDerived

Hypothetical attack flow derived from CVE metadata

Access
Authenticate with export-only IAM credentials
Delivery
Call ImportIam admin API
Exploit
API validates against ExportIAMAction instead of ImportIAMAction
Execution
Bypass permission check
Persist
Create/modify users and policies
Impact
Escalate privileges
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Vulnerability AssessmentAI

Exploitation RustFS versions prior to 1.0.0-alpha.79 with ImportIam admin API enabled. … Additional conditions and limiting factors are described in the full assessment.
Risk Assessment CVSS 8.8 (HIGH). … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in.
Exploit Scenario An attacker without authentication could exploit this vulnerability to unauthorized IAM modification and privilege escalation.
Remediation Monitor vendor advisories for a patch. … Detailed patch versions, workarounds, and compensating controls in full report.
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Within 7 days: Identify all affected systems running Rust. …

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CVE-2026-22042 vulnerability details – vuln.today
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