Integer overflow in Microsoft Malware Protection Engine - CVE-2026-55012
Published: July 17, 2026
Vulnerability identifier: #VU138298
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-2026-55012
CWE-ID: CWE-190
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 integer overflow in Microsoft Defender. A remote attacker can trick a victim to open a specially crafted file, trigger integer overflow and execute arbitrary code on the target system.
Successful exploitation of this vulnerability may result in complete compromise of vulnerable system.
Affected software
Microsoft Malware Protection Engine
How to mitigate CVE-2026-55012
Install updates from vendor's website.
Microsoft Malware Protection Engine - update to 1.1.26060.3008