CVE-2026-63529

Analyzed Analyzed - Analysis Complete

Out-of-Bounds Read in Microsoft Office

Publication date: 2026-08-11

Last updated on: 2026-08-14

Assigner: Microsoft Corporation

Description

Out-of-bounds read in Microsoft Office allows an unauthorized attacker to disclose information 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-2026-63529

EUVD

EUVD-2026-56695

Affected Vendors & Products

Vendor	Product	Version / Range
microsoft	365_apps	*
microsoft	365_apps	*
microsoft	office_2019	*
microsoft	office_2019	*
microsoft	office_2016	*
microsoft	office_2016	*
microsoft	office_2021	*
microsoft	office_2021	*
microsoft	office_2024	*
microsoft	office_2024	*

Helpful Resources

Exploitability

CWE

KEV

CWE ID	Description
CWE-125	The product reads data past the end, or before the beginning, of the intended buffer.

Attack-Flow Graph

Executive Summary

This vulnerability is an out-of-bounds read issue in Microsoft Office. It allows an unauthorized attacker to access and disclose information stored locally on a system by reading beyond the intended memory boundaries.

Detection Guidance

Detection requires monitoring for unusual information disclosure patterns in Microsoft Office applications. Check for unexpected memory access errors or crashes in Office processes. Review system logs for Office-related out-of-bounds read events. Use Microsoft's official update tool to verify patch status.

Impact Analysis

An attacker could exploit this to access sensitive data stored on your device, such as documents or personal information, potentially leading to privacy breaches or further attacks.

Compliance Impact

This vulnerability could lead to unauthorized data disclosure, which may violate compliance requirements like GDPR or HIPAA if sensitive personal or health information is exposed.

Mitigation Strategies

Apply the latest security updates from Microsoft for Office products as soon as they become available to patch the out-of-bounds read vulnerability.

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