Out-of-Bounds Read in Excel Enables Local Code Execution

Publication date: 2026-01-13

Last updated on: 2026-01-13

Assigner: Microsoft Corporation

Description

Out-of-bounds read in Microsoft Office Excel allows an unauthorized attacker to execute code locally.

CVSS Scores

EPSS Scores

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Meta Information

Published

2026-01-13

Last Modified

2026-01-13

Generated

2026-07-06

AI Q&A

2026-01-14

EPSS Evaluated

2026-07-05

NVD

CVE-2026-20946

Affected Vendors & Products

Vendor	Product	Version / Range
microsoft	office_excel	*

Helpful Resources

Exploitability

CWE

KEV

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

Attack-Flow Graph

Executive Summary

This vulnerability is an out-of-bounds read in Microsoft Office Excel that allows an unauthorized attacker to execute code locally on the affected system. [1]

Impact Analysis

The vulnerability can lead to local code execution by an unauthorized attacker, potentially compromising the confidentiality, integrity, and availability of your system and data. [1]

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