CVE-2026-97746

Analyzed Analyzed - Analysis Complete

Integer Underflow in Microsoft Office Excel Allows Code Execution

Publication date: 2026-10-13

Last updated on: 2026-10-15

Assigner: Microsoft Corporation

Description

Integer underflow (wrap or wraparound) in Microsoft Office Excel allows an unauthorized attacker to execute code over a network.

CVSS Scores

EPSS Scores

Probability:
Percentile:

Meta Information

Published

2026-10-13

Last Modified

2026-10-15

Generated

2026-10-19

AI Q&A

2026-10-14

EPSS Evaluated

2026-10-18

NVD

CVE-2026-97746

EUVD

EUVD-2026-100298

Affected Vendors & Products

Vendor	Product	Version / Range
microsoft	365_apps	*
microsoft	365_apps	*
microsoft	microsoft_365	*
microsoft	office_2021	*
microsoft	office_2021	*
microsoft	office_2021	*
microsoft	office_2024	*
microsoft	office_2024	*
microsoft	office_2024	*
microsoft	office_online_server	to 16.0.10417.20228 (exc)

Helpful Resources

Exploitability

CWE

KEV

CWE ID	Description
CWE-191	The product subtracts one value from another, such that the result is less than the minimum allowable integer value, which produces a value that is not equal to the correct result.

Attack-Flow Graph

Executive Summary

This vulnerability is an integer underflow (wrap or wraparound) in Microsoft Office Excel. It allows an unauthorized attacker to execute code remotely over a network without needing user interaction.

Impact Analysis

An attacker could exploit this to run malicious code on your system, potentially stealing data, installing malware, or taking control of your computer if you open a specially crafted Excel file.

Compliance Impact

This vulnerability allows remote code execution via an integer underflow in Microsoft Office Excel, which could lead to unauthorized access or data breaches. Such breaches may violate compliance requirements under GDPR (data protection) and HIPAA (health data security) if sensitive information is exposed.

Mitigation Strategies

Apply the latest security updates from Microsoft for affected Office Excel versions to patch the integer underflow vulnerability.

Hi! I’m here to help you understand CVE-2026-97746. Ask me anything about the vulnerability, its impact, or mitigation strategies.

0/70