Heap-based buffer overflow in Microsoft Office - CVE-2026-111290
Published: November 11, 2026
Vulnerability identifier: #VU164788
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-2026-111290
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 with the victim user's permissions.
The vulnerability exists due to a heap-based buffer overflow in Microsoft Office Word when applying a sharpening correction to an embedded picture in a specially crafted document. A remote attacker can provide a malicious Word document and convince a user to open it, enable editing, and apply the sharpening correction to execute arbitrary code with that user's permissions.
The Preview Pane is not an attack vector.
Affected software
Microsoft Office
How to mitigate CVE-2026-111290
Install security update from vendor's website.
Microsoft Office - addressed in versions 16.0.14334.21048, 16.0.17932.21140