CVE-2026-45498

HighCVSS 7.5/10Known exploited (CISA KEV)Last modified Jul 23, 2026

Description

Microsoft Defender Denial of Service Vulnerability

Metrics

CVSS 3.1 7.5/10CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Weakness enumeration

CWE-400

Affected software

VendorProductVersions
MicrosoftMicrosoft Defender Antimalware Platform>= 4.0.0.0, < 4.18.26040.7

References

Timeline

Published
May 20, 2026
Last modified
Jul 23, 2026
Added to CISA KEV
May 20, 2026
NVD status
Analyzed

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CVE-2026-45498: High severity, CVSS 7.5 | Vulnix