CVE-2026-55012
highpriority · track · 0EPSS 0.005 · 40 %ileDEEUNLUSEPSS · scored 2026-10-27
Integer overflow or wraparound in Microsoft Defender allows an unauthorized attacker to execute code locally.
remediations
Vendor fix, mitigation, or workaround guidance, as published by each source.
A vendor fix is available.
- FixedMicrosoft Malware Protection Enginemsrc_csaf
1.1.26060.3008:Security Update:https://docs.microsoft.com/en-us/microsoft-365/security/defender-endpoint/manage-updates-baselines-microsoft-defender-antivirus?view=o365-worldwide
https://docs.microsoft.com/en-us/microsoft-365/security/defender-endpoint/manage-updates-baselines-microsoft-defender-antivirus?view=o365-worldwide
cvss
Technical severity, 0–10. One row per scoring source.
base score 0–10 · higher = more severe · hover a vector to decode
ssvc
A stakeholder decision — act, attend, or track — from exploitation and impact.
weaknesses
The CWE weakness classes this flaw belongs to.
affected products (8)
Products and version ranges known to be affected.
- Microsoft Defender for Endpoint for Macall versionscert_bundDEcpe:/a:microsoft:defender:for_endpoint_for_mac
- Microsoft Malware Protection Engineall versionscert_bundDEcpe:/a:microsoft:malware_protection_engine:-
- microsoft malware protection engine< 1.1.26060.3008nvdUScpe:2.3:a:microsoft:malware_protection_engine:*:*:*:*:*:*:*:*
advisories (3)
Vendor and ecosystem advisories describing this.
- NCSC-2026-0236Kwetsbaarheden verholpen in Microsoft DefenderNL2026-07-14csaf · ncsc_nlNL
Microsoft heeft kwetsbaarheden verholpen in Defender.
- WID-SEC-W-2026-2322Microsoft Malware Protection Engine und Defender: Mehrere SchwachstellenDeutsch2026-07-14csaf · cert_bundDE
Ein Angreifer kann mehrere Schwachstellen in Microsoft Malware Protection Engine und Microsoft Defender ausnutzen, um beliebigen Programmcode auszuführen, erweiterte Berechtigungen zu erlangen oder vertrauliche Informationen offenzulegen.
- msrc_CVE-2026-55012Microsoft Defender Remote Code Execution Vulnerability2026-07-14csaf · msrc_csafUS
To determine the support lifecycle for your software, see the Microsoft Support Lifecycle: https://support.microsoft.com/lifecycle
also known as (3)
Other names and identifiers for this entity.
sources
Which sources assert this record, and when.
references (3)
External citations — patches, advisories, analysis.
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