CVE-2026-70096
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Heap-based Buffer Overflow in Windows Rich Text Edit Control

Vulnerability report for CVE-2026-70096, including description, CVSS score, EPSS score, affected products, exploitability, helpful resources, and attack-flow context.

Publication date: 2026-10-13

Last updated on: 2026-10-16

Assigner: Microsoft Corporation

Description

Heap-based buffer overflow in Windows Rich Text Edit Control allows an unauthorized attacker to execute code over a network.

CVSS Scores

EPSS Scores

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Meta Information

Published
2026-10-13
Last Modified
2026-10-16
Generated
2026-10-19
AI Q&A
2026-10-14
EPSS Evaluated
2026-10-18
NVD
EUVD

Affected Vendors & Products

Showing 27 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
Microsoft Windows 10 Version 1607 10.0.14393.0
Microsoft Windows 10 Version 1809 10.0.17763.0
Microsoft Windows 10 Version 21H2 10.0.19044.0
Microsoft Windows 10 Version 22H2 10.0.19045.0
Microsoft Windows 11 version 23H2 10.0.22631.0
Microsoft Windows 11 Version 23H2 10.0.22631.0
Microsoft Windows 11 Version 24H2 10.0.26100.0
Microsoft Windows 11 Version 25H2 10.0.26200.0
Microsoft Windows 11 version 26H1 10.0.28000.0
Microsoft Windows 11 Version 26H2 10.0.26300.0
Microsoft Windows Server 2012 6.2.9200.0
Microsoft Windows Server 2012 (Server Core installation) 6.2.9200.0
Microsoft Windows Server 2012 R2 6.3.9600.0
Microsoft Windows Server 2012 R2 (Server Core installation) 6.3.9600.0
Microsoft Windows Server 2016 10.0.14393.0
Microsoft Windows Server 2016 (Server Core installation) 10.0.14393.0
Microsoft Windows Server 2019 10.0.17763.0
Microsoft Windows Server 2019 (Server Core installation) 10.0.17763.0
Microsoft Windows Server 2022 10.0.20348.0
Microsoft Windows Server 2025 10.0.26100.0
Microsoft Windows Server 2025 (Server Core installation) 10.0.26100.0

Helpful Resources

Exploitability

CWE
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KEV
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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

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Executive Summary

This is a heap-based buffer overflow vulnerability in the Windows Rich Text Edit Control. It allows an unauthorized attacker to execute arbitrary code remotely over a network by exploiting memory corruption in the affected component.

Detection Guidance

Detecting this vulnerability requires checking for affected Windows systems and Microsoft Office versions. Use Windows Update to verify patch status. Monitor network traffic for unusual activity targeting Windows Rich Text Edit Control. Check system logs for crashes or errors in related components.

Impact Analysis

An attacker could exploit this to run malicious code on your system, potentially leading to data theft, system compromise, or installation of malware. It affects multiple Windows versions and Microsoft Office products.

Compliance Impact

This vulnerability allows remote code execution via a heap-based buffer overflow, which could lead to unauthorized access to sensitive data. Such breaches may violate GDPR's data protection requirements and HIPAA's safeguards for protected health information, potentially resulting in non-compliance and legal penalties.

Mitigation Strategies

Apply the latest security updates from Microsoft for affected Windows and Office products. Monitor the Microsoft Security Response Center for patches and install them as soon as possible.

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