CVE-2026-107897 in V-SFT
Summary
by MITRE • 10/26/2026
V-SFT provided by FUJI ELECTRIC CO., LTD. contains an out-of-bounds read vulnerability in VS6MemInIF!set_temp_type_default. 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 component known as V-SFT, developed and distributed by FUJI ELECTRIC CO., LTD., contains a critical memory safety vulnerability located within the function set_temp_type_default in the VS6MemInIF module. This specific flaw is classified as an out-of-bounds read, which represents a severe category of memory corruption issues where a program attempts to access data beyond the boundaries of allocated memory buffers. The root cause typically stems from insufficient validation of input parameters or array indices before they are used to calculate memory addresses. In this context, when the application processes configuration files associated with the V7 format, it fails to adequately verify that the requested data length or index remains within the limits of the pre-allocated buffer space. This lack of boundary checking allows an attacker who can supply a specially crafted input file to trigger access to memory locations that are not intended for reading by this specific function call.
The operational impact of exploiting this vulnerability is significant and multifaceted, primarily centering on unauthorized information disclosure and potential remote code execution. When the out-of-bounds read occurs, the application may retrieve sensitive data from adjacent memory regions that were previously allocated to other variables or system structures. This can lead to the leakage of internal state information, cryptographic keys, or user credentials stored in memory, thereby compromising the confidentiality of the system. Furthermore, depending on how the retrieved data is subsequently processed by the software, an attacker might be able to manipulate control flow logic based on the leaked values. In more complex exploitation scenarios involving specific heap layouts and subsequent write operations triggered by the malformed input, this vulnerability could potentially serve as a stepping stone for achieving arbitrary code execution, allowing full compromise of the affected industrial control system or embedded device running V-SFT.
From a threat modeling perspective, this vulnerability aligns with Common Weakness Enumeration identifier CWE-125, which describes out-of-bounds read conditions that allow attackers to access memory beyond allocated boundaries. The exploitation vector is categorized under ATT&CK technique T1083, specifically the File and Directory Discovery sub-technique if used for reconnaissance, or more critically as part of an initial exploit chain leading to privilege escalation or code execution via CWE-787. Given that V-SFT is likely utilized in industrial environments managed by FUJI ELECTRIC, such vulnerabilities pose a heightened risk to operational technology infrastructure where availability and integrity are paramount. The ability to read arbitrary memory can facilitate further attacks against the network segment hosting these systems, potentially leading to disruption of critical processes or unauthorized control over machinery.
To mitigate this vulnerability, immediate action is required from both software vendors and system administrators. FUJI ELECTRIC CO., LTD. should release a patched version of V-SFT that includes rigorous input validation within the VS6MemInIF!set_temp_type_default function. This patch must ensure that all indices and length parameters derived from V7 files are strictly validated against buffer limits before any memory access occurs. Developers should also consider implementing static analysis tools during the software development lifecycle to detect such memory safety issues early, alongside adopting secure coding practices like bounds checking libraries or using languages with automatic memory management where feasible. For existing deployments that cannot be immediately patched, administrators should restrict network access to systems running V-SFT and implement strict file integrity monitoring to prevent the ingestion of untrusted or malformed configuration files. Additionally, enabling advanced endpoint detection and response capabilities can help identify anomalous behavior indicative of exploitation attempts targeting this specific memory corruption flaw.