CVE-2026-44820
Undergoing Analysis Undergoing Analysis - In Progress
Integer Underflow in Microsoft Office Excel Leads to Code Execution

Publication date: 2026-06-09

Last updated on: 2026-06-09

Assigner: Microsoft Corporation

Description
Integer underflow (wrap or wraparound) in Microsoft Office Excel allows an unauthorized attacker to execute code locally.
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Meta Information
Published
2026-06-09
Last Modified
2026-06-09
Generated
2026-06-10
AI Q&A
2026-06-09
EPSS Evaluated
N/A
NVD
CVE-2026-44820
EUVD
EUVD-2026-35663
Affected Vendors & Products
Showing 1 associated CPE
Vendor Product Version / Range
microsoft office_excel *
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.
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Impact Analysis

The vulnerability can lead to local code execution by an unauthorized attacker.

This means an attacker could potentially run malicious code on your system with the privileges of the user running Microsoft Excel.

The CVSS base score of 7.8 indicates a high severity impact affecting confidentiality, integrity, and availability.

Executive Summary

This vulnerability is an integer underflow (wrap or wraparound) issue in Microsoft Office Excel.

It allows an unauthorized attacker to execute code locally on the affected system.

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