Buffer overflow in Microsoft Malware Protection Engine
CVE-2026-55012
Integer overflow or wraparound in Microsoft Defender allows an unauthorized attacker to execute code locally.
Vulnerability class: Buffer Overflow
CVSS v3 metric
CVSS v3 base score 7.8 (High). Vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H.
Affected products
- Microsoft Malware Protection Engine — versions 1.1.0.0
Weakness classification (CWE)
References
- secure@microsoft.com (vendor-advisory, patch)
Frequently asked questions
- What is CVE-2026-55012?
- CVE-2026-55012 is a high-severity vulnerability in Microsoft Malware Protection Engine, classified under Heap-based Buffer Overflow. CVSS score: 7.8/10. Published 2026-07-14.
- How severe is CVE-2026-55012?
- High severity. CVSS v3 base score is 7.8 out of 10.