CVE-2026-45584
High
Description
Heap-based buffer overflow in Microsoft Defender allows an unauthorized attacker to execute code over a network.
SeverityHigh
CVSS8.1
Exploit probability—
Product
Microsoft Malware Protection Engine
PublishedMay 20, 2026
First seenMay 20, 2026
Weakness typeCWE-122CWE-122
How to fix
Update
- microsoft malware_protection_engine1.1.26040.8 or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| microsoft malware_protection_engine | 1.1.26030.3008 ≤ v < 1.1.26040.8 | 1.1.26040.8 |
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