What is CVE-2026-55012?

CVE-2026-55012 is a security advisory published by Microsoft Security Response Center (MSRC) with Critical severity. Microsoft Defender Remote Code Execution Vulnerability

Which CVE IDs does CVE-2026-55012 cover?

CVE-2026-55012 covers the following CVE IDs: CVE-2026-55012. Each CVE has its own detail page on EchelonGraph Pulse with the synthesized EG score.

What is the CVSS v3 score of CVE-2026-55012?

CVE-2026-55012 has a CVSS v3 base score of 7.8, published by Microsoft Security Response Center (MSRC).

Which products are affected by CVE-2026-55012?

CVE-2026-55012 affects 1 product, including: Microsoft Malware Protection Engine.

CVE-2026-55012CriticalCVSS 7.8

Microsoft Defender Remote Code Execution Vulnerability

Vendor

Microsoft Security Response Center (MSRC)

Published

July 17, 2026

Last Modified

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🔗 CVE IDs covered (1)

CVE-2026-55012 →

📋 Description

Integer overflow or wraparound in Microsoft Defender allows an unauthorized attacker to execute code locally.

🎯 Affected products1

Microsoft Malware Protection Engine

✅ Remediation

KBRelease Notes (Security Update) — fixed build 1.1.26060.3008

🔗 References (2)

advisoryhttps://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-55012
referencehttps://docs.microsoft.com/en-us/microsoft-365/security/defender-endpoint/manage-updates-baselines-microsoft-defender-antivirus?view=o365-worldwide