Heap-based buffer overflow in Microsoft Malware Protection Engine - CVE-2026-45584
Published: May 21, 2026
Vulnerability identifier: #VU132034
CSH Severity: Critical
CVSS v4: 9.2 [CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-45584
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 target system.
The vulnerability exists due to a boundary error. A remote attacker can pass a specially crafted file to the system, which once scanned can trigger a heap-based buffer overflow and remote code execution
Successful exploitation of this vulnerability may result in complete compromise of vulnerable system.
Affected software
Microsoft Malware Protection Engine
How to mitigate CVE-2026-45584
Install updates from vendor's website.
Microsoft Malware Protection Engine - update to 1.1.26040.8