CVE-2026-44823
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-2026-44823
EUVD
EUVD-2026-35665
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-197 Truncation errors occur when a primitive is cast to a primitive of a smaller size and data is lost in the conversion.
CWE-416 The product reuses or references memory after it has been freed. At some point afterward, the memory may be allocated again and saved in another pointer, while the original pointer references a location somewhere within the new allocation. Any operations using the original pointer are no longer valid because the memory "belongs" to the code that operates on the new pointer.
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Impact Analysis

The vulnerability can lead to local code execution by an unauthorized attacker, which means the attacker could run malicious code on your system without permission. This can compromise the confidentiality, integrity, and availability of your data and system.

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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