CVE-2026-70329: Microsoft Outlook Remote Code Execution Vulnerability
Integer overflow or wraparound in Microsoft Office Outlook allows an unauthorized attacker to execute code over a network.
Other sources
Microsoft Outlook Remote Code Execution Vulnerability
— Microsoft
Affected Software
Remediation
Recommended actions to resolve this vulnerability, in priority order.
- Upgrade
Upgrade to a fixed release to a version that resolves this vulnerability.
Fixed in https://aka.ms/OfficeSecurityReleases - Upgrade
Upgrade to a fixed release to a version that resolves this vulnerability.
Fixed in 16.0.5565.1000Patch KB5002755
Event History
Frequently Asked Questions
What is the severity of CVE-2026-70329?
The severity of CVE-2026-70329 is rated as high, with a score of 8.8.
How do I fix CVE-2026-70329?
To fix CVE-2026-70329, ensure that you apply the latest security updates provided by Microsoft for affected Outlook and Office versions.
What types of software are affected by CVE-2026-70329?
CVE-2026-70329 affects Microsoft 365 Apps for Enterprise, Microsoft Outlook 2016, Microsoft Office 2019, and Microsoft Office LTSC editions.
What is the nature of the vulnerability in CVE-2026-70329?
CVE-2026-70329 is an integer overflow or wraparound vulnerability that allows remote code execution in Microsoft Outlook.
What can an attacker do with CVE-2026-70329?
An unauthorized attacker can exploit CVE-2026-70329 to execute arbitrary code over a network using vulnerable Microsoft Outlook versions.