cve-2026-45498

CVE-2026-45498 is a denial-of-service vulnerability in the Microsoft Defender Antimalware Platform, disclosed in May 2026. It affects platform version 4.18.26030.3011 and earlier, with the fix delivered in version 4.18.26040.7 through Defender's normal update mechanism. Discussions on WindowsForum highlight that this vulnerability tests an organization's awareness of its endpoint security agent state, as the bug resides in a component often assumed to update automatically. The tag covers threads about verifying Defender platform update drift, understanding the vulnerability's impact, and ensuring systems are patched against CVE-2026-45498.