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    CVE-2026-55011

    Integer underflow (wrap or wraparound) in Microsoft Defender allows an unauthorized attacker to execute code locally.

    Published:Jul 14, 2026
    Last Modified:Jul 14, 2026
    EPS:Jul 14, 2026
    EPSS Score:
    CVSS Score:7.8

    Affected Products

    Vendor
    Microsoft
    Product
    Malware Protection Engine

    Exploits

    No exploit reference

    Common Attack Pattern Enumeration and Classification (CAPEC)

    No CAPEC recorded yet

    Related CVEs

    CVE-2026-69414 (CVSS 7.8) — Microsoft is aware of an elevation of privilege in the Microsoft Malware Protection Engine in Microsoft Defend…
    CVE-2026-55012 (CVSS 7.8) — Integer overflow or wraparound in Microsoft Defender allows an unauthorized attacker to execute code locally.…
    CVE-2026-50656 (CVSS 7.8) — Microsoft is aware of an elevation of privilege in the Microsoft Malware Protection Engine in Microsoft Defend…
    CVE-2026-45584 (CVSS 8.1) — Heap-based buffer overflow in Microsoft Defender allows an unauthorized attacker to execute code over a networ…
    CVE-2026-41091 (CVSS 7.8) — Improper link resolution before file access ('link following') in Microsoft Defender allows an authorized atta…
    CVE-2023-33156 (CVSS 6.3) — Microsoft Defender Elevation of Privilege Vulnerability…
    CVE-2023-24860 (CVSS 7.5) — Microsoft Defender Denial of Service Vulnerability…
    CVE-2023-23389 (CVSS 6.3) — Microsoft Defender Elevation of Privilege Vulnerability…
    CVE-2022-37971 (CVSS 7.1) — Microsoft Windows Defender Elevation of Privilege Vulnerability…
    CVE-2022-24548 (CVSS 5.5) — Microsoft Defender Denial of Service Vulnerability…

    Common Vulnerability Scoring System

    Attack Vector
    Network
    Adjacent
    Local
    Physical
    Privileges Required
    None
    Low
    High
    User Interaction
    None
    Required
    Scope
    Unchanged
    Changed
    Confidentiality
    None
    Low
    High
    Integrity
    None
    Low
    High
    Availability
    None
    Low
    High