Out-of-bounds read in Microsoft Office for macOS and Microsoft Office - CVE-2026-64899
Published: August 12, 2026
Vulnerability identifier: #VU141945
CSH Severity: Medium
CVSS v4: 6.7 [CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:A/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-64899
CWE-ID: CWE-125
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote attacker to disclose sensitive information.
The vulnerability exists due to out-of-bounds read in Microsoft Office for macOS when parsing a crafted Office file. A remote attacker can send a specially crafted Office file to disclose sensitive information.
The Preview Pane is an attack vector, and user interaction is required to open or preview the crafted file.
Affected software
Microsoft Office for macOS
Microsoft Office
Microsoft Office
How to mitigate CVE-2026-64899
Install security update from vendor's website.
Microsoft Office for macOS - update to 16.112.26081010
Microsoft Office - update to 16.0.5565.1001
Microsoft Office - update to 16.0.5565.1001