CVE-2026-45498

CVSS v3.1

7.5

High

Vector

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

Name of the Vulnerable Software and Affected Versions Microsoft Defender (affected versions not specified)

Description A Denial of Service issue exists in Microsoft Defender. Active exploitation of this flaw has been confirmed in real-world incidents.

Recommendations At the moment, there is no information about a newer version that contains a fix for this vulnerability.

DoS

RCE

Resource Exhaustion

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Weakness Enumeration

CVE-2026-45498

Defender