Heap-based buffer overflow in Microsoft Office - CVE-2026-119997
Published: November 11, 2026
Vulnerability identifier: #VU165405
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-2026-119997
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 the victim's system.
The vulnerability exists due to a heap-based buffer overflow in Microsoft Office Outlook when processing a malicious Office file. A remote attacker can send a specially crafted Office file and convince a user to open it to execute arbitrary code on the victim's system.
The Preview Pane is not an attack vector for this vulnerability.
Affected software
Microsoft Office
How to mitigate CVE-2026-119997
Install security update from vendor's website.
Microsoft Office - addressed in versions 16.0.14334.21048, 16.0.17932.21140