Heap-based buffer overflow in Microsoft products - CVE-2026-97741
Published: October 14, 2026 / Updated: October 14, 2026
Vulnerability identifier: #VU155564
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-2026-97741
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 a heap-based buffer overflow in Microsoft Office Excel when processing a malicious Office file. A remote attacker can send a malicious Office file to a user and convince them to open it to execute arbitrary code.
The Preview Pane is not an attack vector for this vulnerability.
Affected software
Microsoft Office 365 for Mac
Microsoft Office LTSC
Microsoft 365 Apps for Enterprise
Microsoft Office LTSC
Microsoft 365 Apps for Enterprise
How to mitigate CVE-2026-97741
Install security update from vendor's website.
Microsoft 365 Apps for Enterprise - addressed in versions 16.0.20228.20274, 16.0.20228.20276, 16.0.20326.20230, 16.0.20326.20232, 16.0.20430.20178, 16.0.20430.20180, 16.0.20430.20182