CVE-2026-108441
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Heap-based Buffer Overflow in Microsoft Office Word

Vulnerability report for CVE-2026-108441, including description, CVSS score, EPSS score, affected products, exploitability, helpful resources, and attack-flow context.

Publication date: 2026-10-15

Last updated on: 2026-10-17

Assigner: Microsoft Corporation

Description

Heap-based buffer overflow in Microsoft Office Word allows an unauthorized attacker to execute code over a network.

CVSS Scores

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Meta Information

Published
2026-10-15
Last Modified
2026-10-17
Generated
2026-10-19
AI Q&A
2026-10-16
EPSS Evaluated
2026-10-18
NVD

Affected Vendors & Products

Showing 6 associated CPEs
Vendor Product Version / Range
Microsoft Microsoft 365 Apps for Enterprise 16.0.1
Microsoft Microsoft Office 365 for Mac 1.0.0
Microsoft Microsoft Office LTSC 2021 16.0.1
Microsoft Microsoft Office LTSC 2024 16.0.0
Microsoft Microsoft Office LTSC for Mac 2021 16.0.1
Microsoft Microsoft Office LTSC for Mac 2024 16.0.0

Helpful Resources

Exploitability

CWE
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KEV
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CWE ID Description
CWE-122 A heap overflow condition is a buffer overflow, where the buffer that can be overwritten is allocated in the heap portion of memory, generally meaning that the buffer was allocated using a routine such as malloc().

Attack-Flow Graph

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Executive Summary

This is a heap-based buffer overflow vulnerability in Microsoft Office Word. It allows an unauthorized attacker to execute arbitrary code remotely over a network by exploiting a flaw in memory handling.

Detection Guidance

This vulnerability involves a heap-based buffer overflow in Microsoft Office Word. Detection requires monitoring for unusual memory usage or crashes in Word processes. Check for suspicious network traffic to/from Word executable. Use process monitoring tools like Process Explorer or Windows Task Manager to observe abnormal Word behavior. Enable Windows Defender Exploit Guard to detect exploit attempts.

Impact Analysis

An attacker could exploit this to run malicious code on your system, potentially stealing data, installing malware, or gaining full control of your device if you open a specially crafted Word document.

Compliance Impact

This vulnerability allows unauthorized code execution via a heap-based buffer overflow in Microsoft Office Word. Such remote code execution risks could lead to unauthorized access to sensitive data, which may violate compliance requirements under GDPR (data protection) and HIPAA (health information privacy) if exploited.

Mitigation Strategies

Apply the latest security updates from Microsoft for Office Word and related products. Disable automatic opening of Office files from untrusted sources. Monitor network traffic for suspicious activity targeting Office applications.

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