Heap-based buffer overflow in Microsoft Office - CVE-2026-119996
Published: November 11, 2026
Vulnerability identifier: #VU165404
CSH Severity: Medium
CVSS v4: 7.1 [CVSS:4.0/AV:L/AC:L/AT:P/PR:N/UI:A/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-119996
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 Outlook when processing attacker-controlled input. A remote attacker can supply specially crafted input that, with user interaction, triggers heap memory corruption to execute arbitrary code.
The Preview Pane is not an attack vector for this vulnerability.
Affected software
Microsoft Office
How to mitigate CVE-2026-119996
Install security update from vendor's website.
Microsoft Office - addressed in versions 16.0.14334.21048, 16.0.17932.21140