CVE-2026-45584

Microsoft Defender Remote Code Execution Vulnerability

Heap-based buffer overflow in Microsoft Defender allows an unauthorized attacker to execute code over a network.

Affected

Microsoft · Microsoft Malware Protection Engine

CVSS v3.1 MICROSOFT

8.1 HIGHCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H

EPSS

0.71% chance of exploitation in the next 30 days, 53rd percentile

Published

2026-05-20

Updated

2026-08-10

Proof-of-concept exploits (1)

• 96613686/CVE-2026-455840★ · 2026-05-22

Security advisories

• https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-45584

References

• CVE Record
• NVD entry

Related

• CVE-2025-62454
• CVE-2025-62470