CVE-2026-32926: V-SFT Information Disclosure Vulnerability

CVE-2026-32926 Overview

CVE-2026-32926 is an out-of-bounds read vulnerability affecting Fuji Electric V-SFT versions 6.2.10.0 and prior. The vulnerability exists in the VS6ComFile!load_link_inf function, where improper boundary checking allows an attacker to read memory beyond the intended buffer boundaries. Successful exploitation requires user interaction—specifically, opening a crafted V7 file—which may lead to information disclosure from the affected product.

Critical Impact

Opening a maliciously crafted V7 file in vulnerable V-SFT installations can expose sensitive information from memory, potentially revealing internal data structures, credentials, or other confidential information processed by the application.

Affected Products

• V-SFT version 6.2.10.0
• V-SFT versions prior to 6.2.10.0
• Fuji Electric V-SFT HMI configuration software

Discovery Timeline

• 2026-04-01 - CVE CVE-2026-32926 published to NVD
• 2026-04-01 - Last updated in NVD database

Technical Details for CVE-2026-32926

Vulnerability Analysis

This vulnerability is classified as CWE-125 (Out-of-Bounds Read), a memory corruption flaw that occurs when software reads data past the end or before the beginning of an intended buffer. In the context of V-SFT, the VS6ComFile!load_link_inf function fails to properly validate input boundaries when parsing V7 project files.

The local attack vector requires user interaction to open a specially crafted V7 file. While this limits opportunistic exploitation, social engineering tactics such as phishing campaigns targeting industrial control system engineers could effectively deliver malicious files. The vulnerability can lead to unauthorized access to sensitive memory contents, potentially exposing confidential configuration data, internal application state, or memory artifacts that could facilitate further attacks.

Root Cause

The root cause of CVE-2026-32926 lies in insufficient bounds checking within the VS6ComFile!load_link_inf function. When processing link information structures in V7 files, the function does not adequately validate that read operations remain within allocated buffer boundaries. This allows a crafted file with malformed size fields or structure definitions to trigger reads beyond the intended memory region.

Attack Vector

The attack requires local access and user interaction. An attacker must craft a malicious V7 file containing manipulated data structures that exploit the bounds-checking deficiency. When a user opens this file with a vulnerable version of V-SFT, the load_link_inf function processes the malformed structures without proper validation, causing the application to read memory beyond the allocated buffer.

The attack scenario typically involves:

1. Creating a specially crafted V7 file with malformed link information structures
2. Delivering the file to a target user via email attachment, file share, or compromised download
3. Convincing the user to open the file in V-SFT
4. The out-of-bounds read occurs during file parsing, potentially disclosing memory contents

For detailed technical information about this vulnerability, refer to the Fujielectric Security Document and the JVN Security Vulnerability Notice.

Detection Methods for CVE-2026-32926

Indicators of Compromise

• Unexpected crashes or error messages in V-SFT when opening V7 files from untrusted sources
• V7 files with unusual file sizes or malformed internal structures arriving via email or file transfers
• Memory access violations or application faults logged in system event logs related to V-SFT processes
• Suspicious V7 files with recent modification timestamps from unknown origins

Detection Strategies

• Implement file integrity monitoring for V7 project files in shared directories and engineering workstations
• Deploy endpoint detection and response (EDR) solutions capable of detecting memory access anomalies in V-SFT processes
• Configure email security gateways to quarantine or scan V7 file attachments from external sources
• Enable application-level logging to capture file open operations and identify suspicious V7 file access patterns

Monitoring Recommendations

• Monitor V-SFT application processes for abnormal memory access patterns or unexpected terminations
• Implement centralized logging for engineering workstations running V-SFT to correlate potential exploitation attempts
• Track file access events for V7 files, particularly those received from external sources or newly created files

How to Mitigate CVE-2026-32926

Immediate Actions Required

• Update V-SFT to the latest version that addresses CVE-2026-32926 as provided by Fuji Electric
• Restrict V7 file handling to only trusted, verified sources until patches are applied
• Educate users about the risks of opening V7 files from unknown or untrusted sources
• Implement network segmentation to isolate engineering workstations from general network traffic

Patch Information

Fuji Electric has released security documentation addressing this vulnerability. Organizations should consult the Fujielectric Security Document for official patch information and update instructions. The JVN Security Vulnerability Notice provides additional guidance on affected versions and remediation steps.

Workarounds

• Implement strict file validation policies that prevent users from opening V7 files received via email or external sources without prior verification
• Deploy application whitelisting to control which processes can open V7 files on engineering workstations
• Use sandboxed environments or isolated virtual machines for opening V7 files from untrusted sources
• Enable Windows Data Execution Prevention (DEP) and Address Space Layout Randomization (ASLR) to limit the impact of memory corruption vulnerabilities

# Windows registry configuration to enable DEP for all processes
# Run as Administrator in Command Prompt
bcdedit /set nx AlwaysOn

# Verify DEP status
wmic OS Get DataExecutionPrevention_SupportPolicy