CVE-2026-108430

Awaiting Analysis Awaiting Analysis - Queue

Heap-based Buffer Overflow in Microsoft Office Word

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

EPSS Scores

Probability:
Percentile:

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

CVE-2026-108430

Affected Vendors & Products

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

KEV

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

Executive Summary

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

Detection Guidance

Detecting this vulnerability requires monitoring for unusual behavior in Microsoft Office Word processes and network traffic. Check for crashes or memory corruption errors in Word. Use tools like Process Explorer or Windows Event Viewer to inspect suspicious Word.exe processes. Monitor network traffic for unexpected outbound connections initiated by Word. Ensure all Microsoft Office updates are applied to prevent exploitation.

Impact Analysis

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

Compliance Impact

This vulnerability allows remote code execution via a heap-based buffer overflow in Microsoft Office Word. Such vulnerabilities could lead to unauthorized data access or modification, which may violate GDPR's data protection requirements or HIPAA's safeguards for protected health information if exploited.

Mitigation Strategies

Apply the latest security updates from Microsoft for Office Word. Disable Office macros if not required. Use network segmentation to limit exposure. Monitor for unusual network traffic or suspicious processes.

Hi! I’m here to help you understand CVE-2026-108430. Ask me anything about the vulnerability, its impact, or mitigation strategies.

0/70