CVE-2026-32927 Overview
CVE-2026-32927 is an out-of-bounds read vulnerability (CWE-125) affecting Fuji Electric V-SFT versions 6.2.10.0 and prior. The vulnerability exists in the VS6MemInIF!set_temp_type_default function and can be triggered when opening a specially crafted V7 file. Successful exploitation may lead to information disclosure from the affected product.
Critical Impact
Opening a maliciously crafted V7 file could allow attackers to read sensitive information from memory beyond intended boundaries, potentially exposing confidential data or system information.
Affected Products
- V-SFT version 6.2.10.0
- V-SFT versions prior to 6.2.10.0
Discovery Timeline
- 2026-04-01 - CVE-2026-32927 published to NVD
- 2026-04-01 - Last updated in NVD database
Technical Details for CVE-2026-32927
Vulnerability Analysis
This vulnerability is classified as an out-of-bounds read (CWE-125), a memory corruption flaw where the application reads data past the end of an allocated buffer. The vulnerable function VS6MemInIF!set_temp_type_default fails to properly validate boundaries when processing V7 file contents.
V-SFT is a software tool used for configuring and programming Fuji Electric industrial touchscreen HMI (Human-Machine Interface) devices. The V7 file format is used to store project configurations for these devices. When the application parses a malformed V7 file, it may read memory locations outside the intended buffer, potentially disclosing sensitive information stored in adjacent memory regions.
The attack requires user interaction—specifically, a victim must open a crafted V7 file. In industrial environments, such files are commonly shared between engineers and operators, making social engineering attacks a viable delivery mechanism.
Root Cause
The root cause is improper bounds checking in the VS6MemInIF!set_temp_type_default function when parsing V7 file structures. The function does not adequately verify that data offsets and lengths within the file remain within allocated buffer boundaries before performing read operations.
Attack Vector
The attack vector is local and requires user interaction. An attacker must craft a malicious V7 project file with specially constructed data that triggers the out-of-bounds read condition. The attacker then needs to convince a target user to open this file using a vulnerable version of V-SFT.
When the victim opens the malicious file, the vulnerable function processes the crafted data and performs memory read operations beyond the allocated buffer. This can expose sensitive information such as:
- Contents of adjacent memory regions
- Internal application data structures
- Potentially sensitive configuration information
The vulnerability mechanism involves malformed data structures within the V7 file format that cause the parser to calculate incorrect memory offsets. For detailed technical information, refer to the JVN Vulnerability Report and Fuji Electric Security Advisory.
Detection Methods for CVE-2026-32927
Indicators of Compromise
- Unexpected V7 files appearing in project directories or received via email
- V-SFT application crashes or abnormal behavior when opening project files
- Unusual memory access patterns or application exceptions in system logs
- Suspicious file transfers containing V7 files from unknown sources
Detection Strategies
- Monitor file system activity for unexpected V7 file creation or modification in V-SFT project directories
- Implement endpoint detection rules to alert on V-SFT application crashes or memory access violations
- Deploy behavioral analysis to detect anomalous file parsing activity by the V-SFT process
- Use SentinelOne's Storyline technology to correlate suspicious file delivery with subsequent V-SFT process behavior
Monitoring Recommendations
- Enable application crash logging and monitoring for V-SFT processes
- Implement email attachment scanning for V7 files from untrusted sources
- Monitor network shares and removable media for suspicious V7 file activity
- Configure SentinelOne agents to detect and alert on memory corruption exploitation attempts
How to Mitigate CVE-2026-32927
Immediate Actions Required
- Identify all systems with V-SFT version 6.2.10.0 or earlier installed
- Restrict the opening of V7 files from untrusted or unknown sources
- Implement file scanning for V7 files received via email or network transfers
- Contact Fuji Electric for patch availability and upgrade guidance
- Isolate affected systems from unnecessary network exposure where feasible
Patch Information
Consult the Fuji Electric Security Advisory for official patch information and updated software versions that address this vulnerability. Organizations should prioritize applying vendor-provided updates as soon as they become available.
Workarounds
- Only open V7 files from trusted and verified sources
- Implement strict file transfer controls and validation procedures for project files
- Consider using isolated virtual machines or sandboxed environments for opening untrusted V7 files
- Apply the principle of least privilege to systems running V-SFT software
- Enable application whitelisting to prevent execution of unauthorized software on ICS workstations
# Example: Restrict V7 file access using file system permissions
# Limit V7 file directory access to authorized users only
chmod 750 /path/to/vsft/projects
chown vsft_admin:vsft_users /path/to/vsft/projects
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
