CVE-2026-107895 in V-SFT
Summary
by MITRE • 10/26/2026
V-SFT provided by FUJI ELECTRIC CO., LTD. contains an out-of-bounds write vulnerability. Opening a crafted V7 file may lead to information exposure or arbitrary code execution on the affected product.
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Analysis
by VulDB Data Team • 10/26/2026
The software package known as V-SFT, developed and distributed by FUJI ELECTRIC CO., LTD., is susceptible to a critical memory corruption flaw classified as an out-of-bounds write vulnerability. This type of defect typically arises when a program writes data beyond the boundaries of allocated memory buffers, often due to insufficient validation of input parameters or incorrect calculations regarding buffer sizes during file parsing operations. In this specific instance, the vulnerability is triggered by processing specially crafted V7 files, which are likely proprietary format documents used within industrial control systems or engineering environments managed by Fuji Electric. The root cause lies in the application's failure to properly verify the length and structure of data contained within these files before attempting to write them into fixed-size memory regions. When a maliciously constructed file is opened, the parser may interpret specific fields as indicating larger data segments than actually exist, or it may fail to account for boundary conditions when copying data from one buffer to another. This discrepancy allows an attacker to overwrite adjacent memory locations that are not intended to be modified by this operation.
The operational impact of such a vulnerability is severe and multifaceted, primarily centering on the compromise of system integrity and availability. An out-of-bounds write can corrupt critical program data structures, leading to immediate application crashes or denial of service conditions where the software becomes unstable and unusable for its intended purpose in industrial settings. More critically, this memory corruption provides a pathway for arbitrary code execution. By carefully crafting the contents of the V7 file, an attacker can overwrite function pointers, return addresses, or other control flow mechanisms within the application's memory space. This manipulation allows the injection and subsequent execution of malicious shellcode with the privileges of the user running the vulnerable software. In industrial environments where V-SFT is likely deployed for configuration management or simulation purposes, successful exploitation could lead to unauthorized changes in system parameters, disruption of production processes, or further lateral movement within a corporate network if the compromised workstation serves as an entry point.
From a threat intelligence perspective, this vulnerability aligns with Common Weakness Enumeration identifier CWE-787, which defines out-of-bounds write errors. The exploitation vector corresponds to ATT&CK technique T1203, specifically the sub-technique of exploiting vulnerabilities for client-side code execution, as it relies on tricking a user into opening a malicious file rather than direct network-based attacks. This classification highlights that while the attack requires initial access via social engineering or compromised distribution channels, the resulting impact is equivalent to remote code execution due to the high privileges typically held by industrial software applications. The ability to expose information also suggests potential data leakage risks, where sensitive configuration details or proprietary process logic stored in memory could be read if the out-of-bounds write inadvertently exposes adjacent buffer contents through subsequent reads or error messages generated during the crash state.
Mitigation strategies must focus on both immediate remediation and long-term secure development practices. The primary defense is to apply vendor-provided patches or updates released by FUJI ELECTRIC CO., LTD. that address the input validation logic within the V7 file parser. Until such patches are available, organizations should implement strict access controls to limit who can execute or open files using this software and isolate systems running vulnerable versions from untrusted networks. Additionally, deploying application whitelisting solutions can prevent unauthorized binaries from executing if exploitation attempts occur. For developers involved in maintaining similar industrial control system components, it is essential to enforce rigorous memory safety checks during the design phase. This includes utilizing bounds-checking libraries, implementing static analysis tools that detect buffer overflow patterns early in the development lifecycle, and conducting regular dynamic testing with fuzzing techniques specifically targeted at proprietary file formats like V7 to identify edge cases before they reach production environments.