CVE-2026-108446

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Use After Free in Microsoft Office Excel Allows Remote Code Execution

Publication date: 2026-10-15

Last updated on: 2026-10-17

Assigner: Microsoft Corporation

Description

Use after free in Microsoft Office Excel allows an unauthorized attacker to execute code over a network.

CVSS Scores

EPSS Scores

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Meta Information

Published

2026-10-15

Last Modified

2026-10-17

Generated

2026-10-19

AI Q&A

2026-10-16

EPSS Evaluated

2026-10-18

NVD

CVE-2026-108446

Affected Vendors & Products

Vendor	Product	Version / Range
Microsoft	Microsoft	365 Apps for Enterprise 16.0.1
Microsoft	Microsoft	Office 365 for Mac 1.0.0
Microsoft	Microsoft	Office LTSC 2021 16.0.1
Microsoft	Microsoft	Office LTSC 2024 16.0.0
Microsoft	Microsoft	Office LTSC for Mac 2021 16.0.1
Microsoft	Microsoft	Office LTSC for Mac 2024 16.0.0
Microsoft	Office	Online Server 16.0.0.0

Helpful Resources

Exploitability

CWE

KEV

CWE ID	Description
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 Any operations using the original pointer are no longer valid because the memory "belongs" to the code that operates on the new pointer.

Attack-Flow Graph

Executive Summary

This vulnerability is a use after free issue in Microsoft Office Excel. It allows an unauthorized attacker to execute arbitrary code over a network by exploiting a flaw where memory is accessed after it has been freed, potentially leading to remote code execution.

Detection Guidance

Detection of this vulnerability requires monitoring for unusual behavior in Microsoft Excel, such as crashes or unexpected code execution. Check for updates from Microsoft to patch the issue. No specific commands are provided in the available context.

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. It requires user interaction, such as opening a specially crafted file.

Compliance Impact

This vulnerability could lead to unauthorized access or data breaches, violating GDPR (data protection) and HIPAA (health data privacy) requirements. Organizations may face fines or legal consequences if exploited.

Mitigation Strategies

Apply the latest security updates from Microsoft for Microsoft Office Excel to patch the use-after-free vulnerability. Disable Excel macros if not required and restrict network access to Office applications until patched.

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