Heap-based buffer overflow in Microsoft Access - CVE-2026-64920
Published: August 12, 2026
Vulnerability identifier: #VU141959
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-2026-64920
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 Access when parsing a crafted Office file. A remote attacker can trick the victim into opening a specially crafted file to execute arbitrary code.
User interaction is required to open a crafted file, and the Preview Pane is not an attack vector.
Affected software
Microsoft Access
How to mitigate CVE-2026-64920
Install security update from vendor's website.
Microsoft Access - update to 16.0.5565.1000