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Microsoft CVE-2026-40363

| EUVDEUVD-2026-29645 HIGH
Heap-based Buffer Overflow (CWE-122)
2026-05-12 microsoft GHSA-wj5j-v4x9-fvq4
8.4
CVSS 3.1 · NVD
Temporal: 7.3
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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
CIRCL (temporal)
7.3 HIGH
cvss

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

Heap-based buffer overflow in Microsoft Office allows an unauthorized attacker to execute code locally.

Analysis

Heap-based buffer overflow in Microsoft Office allows an unauthorized attacker to execute code locally.

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CVE-2026-40363 vulnerability details – vuln.today

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