Stack-based Buffer Overflow in Microsoft Word by Microsoft
CVE-2026-55134

7.8HIGH

Key Information:

Vendor

Microsoft
Status
Microsoft 365 Apps For Enterprise
Microsoft Office 2019
Microsoft Office 365 For Mac
Microsoft Office Ltsc 2021
Vendor
CVE Published:
14 July 2026

What is CVE-2026-55134?

A stack-based buffer overflow vulnerability exists in Microsoft Word that could allow unauthorized attackers to execute arbitrary code on the affected system. This vulnerability could be exploited through malicious documents, potentially allowing for the installation of malware or unauthorized access to sensitive information. Users are encouraged to apply the latest patches provided by Microsoft to mitigate the risks associated with this vulnerability and safeguard their systems.

Affected Version(s)

Microsoft 365 Apps for Enterprise 32-bit Systems 16.0.1

Microsoft Office 2019 32-bit Systems 19.0.0

Microsoft Office 365 for Mac 1.0.0 < 16.111.26071215

References

https://msrc.microsoft.com/update-guide/vulnerability/CVE...
vendor-advisorypatch

CVSS V3.1

Score:
7.8
Severity:
HIGH
Confidentiality:
High
Integrity:
High
Availability:
High
Attack Vector:
Local
Attack Complexity:
Low
Privileges Required:
None
User Interaction:
Required
Scope:
Unchanged

Timeline

  • Vulnerability published

  • Vulnerability Reserved

.