CVE-2026-45498—Microsoft Defender Denial of Service Vulnerability

Vulnerability Name

Microsoft Defender Denial of Service Vulnerability

Description

Microsoft Defender contains an unspecified vulnerability that allows for denial of service.

Known To Be Used in Ransomware Campaigns?

Ransomware Status:

Unknown

Action

Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.

Additional Notes

• https://msrc.microsoft.com/update-guide/en-US/vulnerability/CVE-2026-45498
• https://nvd.nist.gov/vuln/detail/CVE-2026-45498

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