Heap-based buffer overflow in Microsoft Defender allows an unauthorized attacker to execute code over a network.
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This high-severity CVE scores 8.1 under NVD CVSS v3. EPSS exploit probability: 0.0%, top 87% of all CVEs by exploit prediction. GitHub Security Advisory data not yet ingested — confidence will rise once GHSA publishes (typical lag: hours to days for open-source ecosystem CVEs; never for infrastructure-only CVEs).
Heap-based buffer overflow in Microsoft Defender allows an unauthorized attacker to execute code over a network.
May 20, 2026
May 20, 2026
Security Update Guide - Microsoft Security Response Center. Patch available via Microsoft Security Update
https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-45584These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.
See which npm, PyPI, Go, and Maven packages are affected by CVE-2026-45584
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