Main Vulnerability Database Vulnerabilities #VU164981

Heap-based buffer overflow in Microsoft Office for macOS and Microsoft Office - CVE-2026-116717

Published: November 11, 2026

Vulnerability identifier: #VU164981

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-2026-116717

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 on an affected system.

The vulnerability exists due to a heap-based buffer overflow in Microsoft Office when processing a specially crafted file. A remote attacker can trick a user into opening the crafted file to execute arbitrary code on the affected system.

The Preview Pane is not an attack vector for this vulnerability.

Affected software

Microsoft Office for macOS
Microsoft Office

How to mitigate CVE-2026-116717

Install security update from vendor's website.

Microsoft Office for macOS - update to 16.115.26110837
Microsoft Office - addressed in versions 16.0.14334.21048, 16.0.17932.21140

External References

Related Security Bulletins