Integer overflow in Microsoft Office for macOS - CVE-2026-64911
Published: August 12, 2026
Vulnerability identifier: #VU141954
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-2026-64911
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 for macOS when parsing a crafted Office file. A remote attacker can send a specially crafted file to the victim and convince them to open it to execute arbitrary code.
User interaction is required to open a crafted file, and the Preview Pane is not an attack vector.
Affected software
Microsoft Office for macOS
How to mitigate CVE-2026-64911
Install security update from vendor's website.
Microsoft Office for macOS - update to 16.112.26081010