PT-2026-58254 · Microsoft · Malware Protection Engine

Published 2026-07-14 · Updated 2026-07-14 · CVE-2026-55012

Mitre

CVSS v3.1

7.8

High

Base vector

AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

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

Fix

Integer Overflow

Heap Based Buffer Overflow

Weakness Enumeration

CWE-190

CWE-122

Related Identifiers

CVE-2026-55012

Affected Products

Malware Protection Engine

References · 2

• https://nvd.nist.gov/vuln/detail/CVE-2026-55012 · Security Note
• https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-55012 · Vendor Advisory