CVE-2026-108434
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Out-of-bounds Read in Microsoft Office Word

Vulnerability report for CVE-2026-108434, including description, CVSS score, EPSS score, affected products, exploitability, helpful resources, and attack-flow context.

Publication date: 2026-10-15

Last updated on: 2026-10-16

Assigner: Microsoft Corporation

Description

Out-of-bounds read in Microsoft Office Word allows an unauthorized attacker to disclose information over a network.

CVSS Scores

EPSS Scores

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Meta Information

Published
2026-10-15
Last Modified
2026-10-16
Generated
2026-10-19
AI Q&A
2026-10-16
EPSS Evaluated
2026-10-18
NVD

Affected Vendors & Products

Showing 6 associated CPEs
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
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KEV
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CWE ID Description
CWE-125 The product reads data past the end, or before the beginning, of the intended buffer.

Attack-Flow Graph

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Executive Summary

This is an out-of-bounds read vulnerability in Microsoft Office Word. It allows an unauthorized attacker to read memory outside the intended boundary, potentially disclosing sensitive information over a network.

Detection Guidance

This vulnerability is an out-of-bounds read in Microsoft Office Word. Detection typically requires scanning for vulnerable versions of Microsoft Office products using tools like Microsoft's own update checks or vulnerability scanners. No specific commands are provided in the available context.

Impact Analysis

An attacker could exploit this to access confidential data, such as documents or sensitive information, without proper authorization. This may lead to data leaks or unauthorized information disclosure.

Compliance Impact

This vulnerability could lead to unauthorized data exposure, violating GDPR (data protection) and HIPAA (health information privacy) requirements. Organizations may face compliance penalties if sensitive data is compromised.

Mitigation Strategies

Apply the latest security updates from Microsoft for Office Word and related products. Monitor Microsoft's security advisories for patches and enable automatic updates where possible.

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EPSS Chart