CVE-2026-108448

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Heap-based Buffer Overflow in Microsoft Office Outlook

Publication date: 2026-10-15

Last updated on: 2026-10-17

Assigner: Microsoft Corporation

Description

Heap-based buffer overflow in Microsoft Office Outlook allows an unauthorized attacker to execute code over a network.

CVSS Scores

EPSS Scores

Probability:
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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-2026-108448

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

Helpful Resources

Exploitability

CWE

KEV

CWE ID	Description
CWE-122	A heap overflow condition is a buffer overflow, where the buffer that can be overwritten is allocated in the heap portion of memory, generally meaning that the buffer was allocated using a routine such as malloc().

Attack-Flow Graph

Executive Summary

This is a heap-based buffer overflow vulnerability in Microsoft Office Outlook. It allows an unauthorized attacker to execute arbitrary code remotely over a network by exploiting a flaw in memory handling.

Detection Guidance

Detecting this vulnerability requires monitoring for unusual network activity or suspicious Outlook processes. Check for unexpected memory usage spikes in Outlook, examine network traffic for unusual data transfers, and review system logs for crashes or errors related to Outlook. Use tools like Windows Event Viewer, Process Explorer, or network monitoring software to inspect suspicious behavior.

Impact Analysis

An attacker could exploit this to run malicious code on your system, potentially stealing data, installing malware, or gaining control of your device. It requires user interaction like opening a specially crafted file.

Compliance Impact

This vulnerability allows unauthorized code execution, which could lead to unauthorized access or data breaches. Such breaches may violate compliance requirements under GDPR (data protection) and HIPAA (health information security) by exposing sensitive data.

Mitigation Strategies

Apply the latest security updates from Microsoft for Outlook and related Office products. Disable unnecessary network-facing services in Outlook if possible. Monitor network traffic for suspicious activity targeting Outlook processes.

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