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CVE-2026-45584

Microsoft Defender Remote Code Execution Vulnerability

HIGH
8.1
CVSS Score
Published: May 20, 2026 at 01:09 PM UTC
Updated: August 10, 2026 at 03:40 PM UTC
1 product affected across 1 vendorMalware Protection Engine

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Severity
HIGH8.1
Exploit prediction
EPSS 0.9%
SSVC
No known exploit

Description

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

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

Malware Protection Engine· Microsoft
95%
1.1.0.0 ≤ v < 1.1.26040.81.1.26030.3008 ≤ v < 1.1.26040.81.1.0.0
Affected range stops below 1.1.26040.8, so it looks safe — our inference, not a vendor statement

Remediation

No guide yet

No remediation guidance has been written for this CVE yet. What the record does show:

Patch and advisory references

References (1)

Vendor AdvisoryPatch
Source: [email protected]
https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-45584

SSVC — Action Prioritization

SSVCNo known exploitNot automatableTotal impact

SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.

CVSS

8.1HIGHmicrosoft
Vector?

Quick Info

StatusANALYZED
CWE
CWE-122

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