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Microsoft CVE-2026-40366

| EUVDEUVD-2026-29648 HIGH
Use After Free (CWE-416)
2026-05-12 microsoft GHSA-gw2g-hq8h-6fvx
Denial Of Service Microsoft Use After Free Memory Corruption
8.4
CVSS 3.1 · NVD
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Severity by source

NVD PRIMARY
8.4 HIGH
AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
ENISA EUVD
HIGH
qualitative

Primary rating from NVD.

CVSS VectorNVD

CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Attack Vector
Local
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High

Lifecycle Timeline

1
CVE Published
May 12, 2026 - 16:58 nvd
HIGH 8.4

DescriptionCVE.org

Use after free in Microsoft Office Word allows an unauthorized attacker to execute code locally.

Articles & Coverage 1

blog.talosintelligence.com Microsoft May 2026 Patch Tuesday: 31 Critical RCE Vulnerabilities Including Windows, Office, Azure May 12, 2026

Analysis

Use after free in Microsoft Office Word allows an unauthorized attacker to execute code locally.

Same weakness CWE-416 – Use After Free

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CVE-2014-0322 HIGH POC
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CVE-2012-4792 HIGH POC
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CVE-2009-4324 HIGH POC
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CVE-2015-0313 CRITICAL POC
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CVE-2015-5122 CRITICAL POC
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CVE-2013-2551 HIGH POC
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Same technique Denial Of Service

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CVE-2015-5119 CRITICAL POC
9.8
CVE-2011-2462 CRITICAL POC
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CVE-2011-0611 HIGH POC
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CVE-2012-1889 HIGH POC
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CVE-2012-0507 CRITICAL POC
9.8
CVE-2014-1761 HIGH POC
7.8
CVE-2015-5122 CRITICAL POC
9.8
CVE-2011-0609 HIGH POC
7.8

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CVE-2026-40366 vulnerability details – vuln.today
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