CVE-2026-64907

Analyzed Analyzed - Analysis Complete

Microsoft Office Word Stack-Based Buffer Overflow

Publication date: 2026-08-11

Last updated on: 2026-08-14

Assigner: Microsoft Corporation

Description

Stack-based buffer overflow in Microsoft Office Word allows an unauthorized attacker to execute code locally.

CVSS Scores

EPSS Scores

Probability:
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Meta Information

Published

2026-08-11

Last Modified

2026-08-14

Generated

2026-09-01

AI Q&A

2026-08-12

EPSS Evaluated

2026-08-30

NVD

CVE-2026-64907

EUVD

EUVD-2026-56709

Affected Vendors & Products

Vendor	Product	Version / Range
microsoft	365_apps	*
microsoft	365_apps	*
microsoft	word	2016
microsoft	word	2016
microsoft	office_2019	*
microsoft	office_2019	*
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-121	A stack-based buffer overflow condition is a condition where the buffer being overwritten is allocated on the stack (i.e., is a local variable or, rarely, a parameter to a function).

Attack-Flow Graph

Executive Summary

This is a stack-based buffer overflow vulnerability in Microsoft Office Word. It allows an unauthorized attacker to execute arbitrary code on a victim's system by exploiting a flaw in how Word handles certain data.

Detection Guidance

Detection requires monitoring for unusual behavior in Microsoft Office Word processes. Check for crashes or memory corruption errors in Word logs. Use process monitoring tools like Process Explorer to inspect Word.exe for unexpected memory usage patterns. Ensure all Office updates are applied to prevent exploitation.

Impact Analysis

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

Compliance Impact

This vulnerability allows unauthorized code execution, which could lead to unauthorized access to sensitive data. This 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 immediately to patch the stack-based buffer overflow vulnerability.

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