CVE-2026-64906

Analyzed Analyzed - Analysis Complete

Heap-based Buffer Overflow in Microsoft Office Access

Publication date: 2026-08-11

Last updated on: 2026-08-14

Assigner: Microsoft Corporation

Description

Heap-based buffer overflow in Microsoft Office Access 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

2026-08-31

AI Q&A

2026-08-12

EPSS Evaluated

2026-08-30

NVD

CVE-2026-64906

EUVD

EUVD-2026-56710

Affected Vendors & Products

Vendor	Product	Version / Range
microsoft	365_apps	*
microsoft	365_apps	*
microsoft	office_2019	*
microsoft	office_2019	*
microsoft	office_2021	*
microsoft	office_2021	*
microsoft	office_2024	*
microsoft	office_2024	*
microsoft	access	2016
microsoft	access	2016

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 vulnerability in Microsoft Office Access. It allows an unauthorized attacker to execute arbitrary code on a local system by exploiting a flaw in memory handling.

Detection Guidance

Detection typically involves monitoring for unusual memory access patterns or crashes in Microsoft Office Access. Check for recent crashes or error logs in Office applications. Use system monitoring tools to watch for suspicious processes spawned by Access. Ensure all Office software is updated to the latest patched version.

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 like opening a specially crafted file.

Compliance Impact

This vulnerability allows remote code execution via a heap-based buffer overflow in Microsoft Office Access. Such vulnerabilities can lead to unauthorized data access, modification, or exfiltration, which may violate GDPR (data protection) and HIPAA (health data privacy) requirements for safeguarding sensitive information.

Mitigation Strategies

Apply the latest security updates from Microsoft for Office Access as soon as possible to patch the heap-based buffer overflow vulnerability.

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