CVE-2026-55012: Microsoft Defender Remote Code Execution Vulnerability
Integer overflow or wraparound in Microsoft Defender allows an unauthorized attacker to execute code locally.
Other sources
Microsoft Defender Remote Code Execution Vulnerability
— Microsoft
Affected Software
Remediation
Recommended actions to resolve this vulnerability, in priority order.
- Upgrade
Upgrade to a fixed release to a version that resolves this vulnerability.
Fixed in 1.1.26060.3008
Event History
Frequently Asked Questions
What is the severity of CVE-2026-55012?
CVE-2026-55012 has a severity score of 7.8, categorized as high.
How do I fix CVE-2026-55012?
To fix CVE-2026-55012, users should update their Microsoft Defender software to the latest version released by Microsoft.
What type of vulnerability is CVE-2026-55012?
CVE-2026-55012 is classified as a Remote Code Execution vulnerability caused by an integer overflow.
Who is affected by CVE-2026-55012?
CVE-2026-55012 affects users of Microsoft Defender and the Microsoft Malware Protection Engine.
What are the potential impacts of CVE-2026-55012?
Exploitation of CVE-2026-55012 could allow unauthorized attackers to execute code locally on vulnerable systems.