Heap-based buffer overflow in Microsoft Office - CVE-2026-50301
Published: July 17, 2026
Vulnerability identifier: #VU138188
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-2026-50301
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 heap-based buffer overflow in Microsoft Office when parsing a crafted Office file. A remote attacker can send a specially crafted file to the victim to execute arbitrary code.
User interaction is required to open or preview the crafted file, and the Preview Pane can serve as an attack vector.
Affected software
Microsoft Office
How to mitigate CVE-2026-50301
Install security update from vendor's website.
Microsoft Office - update to 16.0.5561.1000