Local service interruption via resource exhaustion
Published May 20, 2026 · Updated May 20, 2026
Uncontrolled resource consumption in Microsoft Defender Antimalware Platform before 4.18.26040.7 allows local users to interrupt antivirus service. Microsoft has not disclosed the input, code path, or resource whose unbounded consumption exhausts the antimalware platform. Exploitation requires local access but no privileges or user interaction; the published impact is limited availability loss, and CISA reports active exploitation.
Summary
What happened
Uncontrolled resource consumption in Microsoft Defender Antimalware Platform before 4.18.26040.7 allows local users to interrupt antivirus service. Microsoft has not disclosed the input, code path, or resource whose unbounded consumption exhausts the antimalware platform. Exploitation requires local access but no privileges or user interaction; the published impact is limited availability loss, and CISA reports active exploitation.
The record
- CVE
- CVE-2026-45498
- Published
- May 20, 2026
- Updated
- May 20, 2026
- Vendor
- Microsoft
- Product
- Microsoft Defender Antivirus Antimalware Platform
- Classifications
- CWE-400, T1562.001
- Attack vector
- local
- Privileges
- unauthenticated
Timeline
How it unfolded
- May 20, 2026CVE publishedPublication date reported by the CVE source.
- May 20, 2026Record updatedLatest update available in the CVE record.
Exploitability
Present is not the same as exploitable
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Is a vulnerable build present?
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- Affected versionversion=-
What conditions does exploitation require?
What is affected?
Published CVSS scores
CVSS describes severity. EPSS estimates exploitation probability.
Attacks
What attackers are doing with it
Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.
Weakness, pattern, technique
Public exploit references
No public exploit references are available in this record.
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Reported exploitation
- CISA Known Exploited Vulnerabilities Catalog entryknown exploited catalog
Technologies
Your stack
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Your stack
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