CVE-2026-45498 Details
Description
Microsoft Defender Denial of Service Vulnerability
A denial-of-service vulnerability has been identified in the Microsoft Defender Antimalware Platform, specifically in version 4.18.26030.3011. This vulnerability can disrupt the normal functioning of the application, potentially leading to a degradation of service or performance.
Users should verify that the latest version of the Microsoft Malware Protection Platform and definition updates are being actively downloaded and installed. For enterprise deployments, it is recommended to configure products for automatic updating. Customers can also manually check for updates at any time.
Metrics
CVSS 4.0 Severity and Vector Strings:
No CVSS 4.0 data is available for this CVE.
CVSS 3.x Severity and Vector Strings:
No data available for CVSS Version 2.0 on this CVE.
CISA-ADP
Assessed May 21, 2026References to Advisories, Solutions, and Tools
By selecting these links, you will be leaving this site. These are references gathered from the official CVE record and are not endorsed by Volerion.
| URL | Source(s) | Tag(s) |
|---|---|---|
| https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2026-45498 | CISA-ADP | Third Party AdvisoryUS Government Resource |
| https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-45498 | [email protected] | Vendor Advisory |
This CVE is in CISA's Known Exploited Vulnerabilities Catalog
Reference CISA's BOD 22-01 and Known Exploited Vulnerabilities Catalog for further guidance and requirements.
| Vulnerability Name | Date Added | Due Date | Required Action |
|---|---|---|---|
| Microsoft Defender Denial of Service Vulnerability | May 20, 2026 | Jun 3, 2026 | Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable. |
Weakness Enumeration
| CWE-ID | CWE Name | Source |
|---|---|---|
| CWE-400 | Uncontrolled Resource Consumption | [email protected] |
Affected Products
| Product | Versions |
|---|---|
| microsoft defender antimalware platform | < 4.18.26040.7 |
CPE
Remediation
| |
Change History
11 change records found show changes
| Date | Action | Recorded By |
|---|---|---|
| Jul 23, 2026 | CVE Translated | [email protected] |
| Jun 17, 2026 | CVE Modified | [email protected] |
| Jun 17, 2026 | CVE Modified | CISA-ADP |
| May 28, 2026 | Modified Analysis | [email protected] |
| May 27, 2026 | CVE Modified | CISA-ADP |
| May 26, 2026 | Modified Analysis | [email protected] |
| May 26, 2026 | CVE Modified | [email protected] |
| May 20, 2026 | Initial Analysis | [email protected] |
| May 20, 2026 | CVE CISA KEV Update | Cybersecurity and Infrastructure Security Agency (CISA) U.S. Civilian Government |
| May 20, 2026 | CVE Modified | CISA-ADP |
| May 20, 2026 | New CVE Received | [email protected] |