Integer overflow in Microsoft Outlook - CVE-2026-70329
Published: August 12, 2026
Vulnerability identifier: #VU141858
CSH Severity: High
CVSS v4: 8.4 [CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:A/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-70329
CWE-ID: CWE-190
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote attacker to execute arbitrary code.
The vulnerability exists due to integer overflow or wraparound in Microsoft Office Outlook when processing a crafted Office file. A remote attacker can send a specially crafted Office file to execute arbitrary code.
User interaction is required to open the crafted file.
Affected software
Microsoft Outlook
How to mitigate CVE-2026-70329
Install security update from vendor's website.
Microsoft Outlook - update to 16.0.5565.1000