Jul 2026: Microsoft Defender Remote Code Execution Vulnerability
CVE-2026-55011 Published on July 14, 2026
Microsoft Defender Remote Code Execution Vulnerability
Integer underflow (wrap or wraparound) in Microsoft Defender allows an unauthorized attacker to execute code locally.
Weakness Type
What is an Integer underflow Vulnerability?
The product subtracts one value from another, such that the result is less than the minimum allowable integer value, which produces a value that is not equal to the correct result. This can happen in signed and unsigned cases.
CVE-2026-55011 has been classified to as an Integer underflow vulnerability or weakness.
Products Associated with CVE-2026-55011
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Affected Versions
Microsoft Malware Protection Engine:- Version 1.1.0.0 and below 1.1.26060.3008 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.