May 2026: Microsoft Defender Remote Code Execution Vulnerability
CVE-2026-45584 Published on May 20, 2026
Microsoft Defender Remote Code Execution Vulnerability
Heap-based buffer overflow in Microsoft Defender allows an unauthorized attacker to execute code over a network.
Weakness Type
Heap-based Buffer Overflow
A heap overflow condition is a buffer overflow, where the buffer that can be overwritten is allocated in the heap portion of memory, generally meaning that the buffer was allocated using a routine such as malloc().
Products Associated with CVE-2026-45584
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Affected Versions
Microsoft Malware Protection Engine:- Version 1.1.0.0 and below 1.1.26040.8 is affected.
Exploit Probability
EPSS (Exploit Prediction Scoring System) scores estimate the probability that a vulnerability will be exploited in the wild within the next 30 days. The percentile shows you how this score compares to all other vulnerabilities.