CVE-2026-45498Microsoft Defender Denial of Service Vulnerability

In plain English

A medium-severity uncontrolled resource consumption in Microsoft Defender Antimalware Platform from Microsoft. Attackers are actively exploiting it in the wild (listed by CISA on May 20, 2026). The chance it is exploited in the next 30 days is estimated at 63.1% (higher than 99.2% of all known vulnerabilities). Ready-made attack tooling exists: public proof-of-concept code. Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.