CVE-2026-108441 in Office
Summary
by MITRE • 10/16/2026
Heap-based buffer overflow in Microsoft Office Word allows an unauthorized attacker to execute code over a network.
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Analysis
by VulDB Data Team • 10/16/2026
The vulnerability described constitutes a critical security flaw within the Microsoft Office Word application, specifically manifesting as a heap-based buffer overflow condition. This type of memory corruption error occurs when a program writes data beyond the allocated boundaries of a buffer located in the heap segment of computer memory. In the context of Microsoft Office Word, this defect is typically triggered by processing specially crafted documents or files that contain malformed content structures. The attacker exploits this weakness to overwrite adjacent memory locations with malicious shellcode or other executable payloads, thereby gaining the ability to execute arbitrary code on the target system.
The operational impact of this vulnerability is severe due to its network-vector nature and high privilege level. Because Microsoft Office Word is a widely used productivity tool, it serves as an attractive attack surface for threat actors seeking initial access to corporate networks or individual systems. An unauthorized attacker can exploit this flaw remotely without requiring any user interaction beyond opening the malicious document, although some variants may rely on social engineering tactics such as tricking users into enabling macros or editing content. Successful exploitation results in complete system compromise, allowing the adversary to install malware, steal sensitive data, create backdoors for persistent access, and potentially pivot to other systems within the network infrastructure. This aligns with common attack patterns observed in advanced persistent threat campaigns where document-based exploits are used as initial delivery mechanisms.
From a technical classification perspective, this vulnerability maps directly to CWE-122, which denotes heap-based buffer overflow, indicating that the root cause lies in improper boundary checks during memory allocation and copy operations within the application's codebase. Furthermore, the exploitation method corresponds to MITRE ATT&CK technique T1059, specifically Command and Scripting Interpreter subtechniques, as well as T1203, Exploitation for Client Execution. The remote nature of the attack places it under initial access vectors often associated with spear-phishing or drive-by download scenarios where malicious documents are distributed via email attachments or compromised websites.
Mitigation strategies must focus on both immediate remediation and long-term defensive posture improvements. Organizations should immediately apply the latest security patches released by Microsoft to update Word and related Office components, ensuring that known vulnerabilities in memory management routines are addressed. Network segmentation can help limit lateral movement if an endpoint is successfully exploited. Additionally, deploying application whitelisting solutions such as AppLocker or Windows Defender Application Control can prevent unauthorized scripts from executing even if the initial exploit succeeds. Users should be educated on recognizing suspicious file types and avoiding opening documents from untrusted sources. Enabling Protected View for files originating from the internet adds an extra layer of isolation by loading these documents in a sandboxed environment, preventing direct interaction with system resources until explicitly trusted by the user. Regular vulnerability scanning and penetration testing can also help identify similar misconfigurations or outdated software versions across the enterprise infrastructure before they are exploited by malicious actors.