CVE-2026-105715

Analyzed Analyzed - Analysis Complete

Integer Overflow in Microsoft Office Word Leads to Remote Code Execution

Publication date: 2026-10-13

Last updated on: 2026-10-15

Assigner: Microsoft Corporation

Description

Integer overflow or wraparound in Microsoft Office Word allows an unauthorized attacker to execute code over a network.

CVSS Scores

EPSS Scores

Probability:
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Meta Information

Published

2026-10-13

Last Modified

2026-10-15

Generated

2026-10-19

AI Q&A

2026-10-14

EPSS Evaluated

2026-10-18

NVD

CVE-2026-105715

EUVD

EUVD-2026-99063

Affected Vendors & Products

Vendor	Product	Version / Range
microsoft	365_apps	*
microsoft	365_apps	*
microsoft	microsoft_365	*
microsoft	office_2021	*
microsoft	office_2021	*
microsoft	office_2021	*
microsoft	office_2024	*
microsoft	office_2024	*
microsoft	office_2024	*

Helpful Resources

Exploitability

CWE

KEV

CWE ID	Description
CWE-416	The product reuses or references memory after it has been freed. At some point afterward, the memory may be allocated again and saved in another pointer, while the original pointer references a location somewhere within the new allocation. Any operations using the original pointer are no longer valid because the memory "belongs" to the code that operates on the new pointer.
CWE-190	The product performs a calculation that can produce an integer overflow or wraparound when the logic assumes that the resulting value will always be larger than the original value. This occurs when an integer value is incremented to a value that is too large to store in the associated representation. When this occurs, the value may become a very small or negative number.

Attack-Flow Graph

Executive Summary

This vulnerability is an integer overflow or wraparound flaw in Microsoft Office Word. It allows an unauthorized attacker to execute arbitrary code remotely over a network without requiring user interaction.

Detection Guidance

Detection typically involves monitoring for unusual behavior in Microsoft Office Word processes, such as unexpected memory usage or crashes. Check for updates from Microsoft to identify affected versions. Use network monitoring tools to detect suspicious outbound connections from Word processes.

Impact Analysis

An attacker could exploit this to run malicious code on your system, potentially stealing data, installing malware, or taking control of your device. It requires tricking a user into opening a specially crafted Word document.

Compliance Impact

This vulnerability allows remote code execution via an integer overflow in Microsoft Office Word, which could lead to unauthorized access or data breaches. Such breaches may violate GDPR's data protection requirements or HIPAA's safeguards for protected health information, depending on the data involved.

Mitigation Strategies

Apply the latest security updates from Microsoft for Office Word as soon as possible to patch the integer overflow vulnerability.

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