CVE-2026-22052: ONTAP S3 Information Disclosure Flaw

CVE-2026-22052 Overview

CVE-2026-22052 is an information disclosure vulnerability affecting NetApp ONTAP versions 9.12.1 and higher when configured with S3 NAS buckets. This vulnerability allows an authenticated attacker to bypass directory permission controls and view listings of directory contents that should otherwise be inaccessible to them.

Critical Impact

Authenticated attackers can enumerate directory contents beyond their authorized access scope, potentially exposing sensitive file listings, directory structures, and organizational data stored in S3 NAS buckets.

Affected Products

• NetApp ONTAP versions 9.12.1 and higher
• Systems configured with S3 NAS buckets

Discovery Timeline

• 2026-03-05 - CVE CVE-2026-22052 published to NVD
• 2026-03-05 - Last updated in NVD database

Technical Details for CVE-2026-22052

Vulnerability Analysis

This vulnerability represents an access control flaw in the S3 NAS bucket implementation within NetApp ONTAP. The core issue lies in how ONTAP handles permission checks when processing directory listing requests through the S3 interface for NAS buckets. While a user may be properly authenticated to the system, the authorization checks that govern directory enumeration are insufficient, allowing the authenticated user to obtain directory listings for paths where they lack the appropriate read permissions.

The network-accessible nature of this vulnerability means that any authenticated user with network access to the affected ONTAP system can potentially exploit this flaw without requiring elevated privileges or user interaction. The impact is limited to confidentiality concerns, specifically the exposure of directory content listings, without affecting data integrity or system availability.

Root Cause

The vulnerability stems from improper access control validation in the S3 NAS bucket directory listing functionality. When handling S3 API requests for directory enumeration, the ONTAP system fails to properly enforce NAS-level permission checks. This results in a gap between S3 access credentials and the underlying NAS file system permissions, allowing authenticated users to circumvent directory access restrictions.

Attack Vector

An authenticated attacker with network access to the affected ONTAP system can exploit this vulnerability by sending crafted S3 API requests targeting directory paths. The attacker does not need any special privileges beyond valid authentication credentials. By enumerating directories they should not have access to, attackers can discover:

• Sensitive file names and directory structures
• Internal organizational naming conventions
• Potential targets for further attacks
• Metadata that may reveal confidential project or data information

The attack requires no user interaction and can be executed remotely over the network, making it accessible to any authenticated user on the network segment.

Detection Methods for CVE-2026-22052

Indicators of Compromise

• Unexpected S3 API directory listing requests from authenticated users to paths outside their normal access scope
• Elevated frequency of ListObjects or similar S3 directory enumeration API calls
• Access log entries showing authenticated users querying directory paths they have not historically accessed
• Audit trail discrepancies between NAS permission denials and successful S3 directory listings

Detection Strategies

• Enable comprehensive S3 API request logging on ONTAP systems to capture all directory listing operations
• Implement alerting for authenticated users accessing directory paths outside their designated access areas
• Cross-reference S3 API access logs with NAS permission configurations to identify authorization bypass attempts
• Deploy network traffic analysis to identify unusual patterns in S3 bucket enumeration requests

Monitoring Recommendations

• Configure ONTAP audit logging to capture all S3 NAS bucket access attempts with user identity correlation
• Establish baseline access patterns for authenticated users and alert on deviations
• Integrate ONTAP logs with SIEM solutions for centralized monitoring and anomaly detection
• Regularly review access logs for directory listing operations that span multiple bucket paths

How to Mitigate CVE-2026-22052

Immediate Actions Required

• Review the NetApp Security Advisory NTAP-20260304-0001 for official guidance and available patches
• Audit current S3 NAS bucket configurations and identify all systems running ONTAP 9.12.1 or higher with S3 NAS buckets enabled
• Implement network segmentation to limit authenticated user access to S3 NAS bucket interfaces
• Enable enhanced logging and monitoring on affected systems to detect potential exploitation attempts

Patch Information

NetApp has published security advisory NTAP-20260304-0001 addressing this vulnerability. Organizations should consult this advisory for official patch information, affected version details, and remediation guidance specific to their deployment configuration.

Workarounds

• Restrict network access to S3 NAS bucket interfaces to only trusted and necessary users or systems
• Implement additional network-level access controls such as firewall rules or ACLs to limit exposure
• Consider temporarily disabling S3 NAS bucket functionality if not business-critical until patches are applied
• Apply the principle of least privilege to all authenticated accounts with access to ONTAP systems