CVE-2026-70242

Awaiting Analysis Awaiting Analysis - Queue

Heap-based Buffer Overflow in Microsoft Office Outlook

Publication date: 2026-10-13

Last updated on: 2026-10-13

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:
Percentile:

Meta Information

Published

2026-10-13

Last Modified

2026-10-13

Generated

2026-10-14

AI Q&A

2026-10-14

EPSS Evaluated

N/A

NVD

CVE-2026-70242

EUVD

EUVD-2026-100171

Affected Vendors & Products

Vendor	Product	Version / Range
Microsoft	Microsoft	365 Apps for Enterprise 16.0.1
Microsoft	Microsoft	Office LTSC 2021 16.0.1
Microsoft	Microsoft	Office LTSC 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 over a network by exploiting a flaw in memory handling.

Impact Analysis

An attacker could exploit this to run malicious code on your system, potentially stealing data, installing malware, or taking control of your device without your knowledge.

Compliance Impact

This vulnerability could lead to unauthorized data access or exfiltration, 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 affected Office products. Disable network access to Outlook if not required. Monitor network traffic for suspicious activity targeting Outlook services.

Hi! I’m here to help you understand CVE-2026-70242. Ask me anything about the vulnerability, its impact, or mitigation strategies.

0/70