Heap-based buffer overflow in Microsoft Office for macOS and Microsoft Word - CVE-2026-64915
Published: August 12, 2026
Vulnerability identifier: #VU141958
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-2026-64915
CWE-ID: CWE-122
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 heap-based buffer overflow in Microsoft Office Word when parsing 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, and the Preview Pane is not an attack vector.
Affected software
Microsoft Office for macOS
Microsoft Word
Microsoft Word
How to mitigate CVE-2026-64915
Install security update from vendor's website.
Microsoft Office for macOS - update to 16.112.26081010
Microsoft Word - update to 16.0.5565.1000
Microsoft Word - update to 16.0.5565.1000