Threat Intelligence / CVE / CVE-2026-40366

CVE-2026-40366

CVSS 8.4 (HIGH) · EPSS 0.1% · Published 2026-05-12

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

CVSS v3 vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C

Weaknesses (CWE)

CWE-416

Threats tracking this CVE

Microsoft May 2026 Patch Tuesday — 137 CVEs, 31 Critical (16 RCE) Including CVE-2026-41089 Pre-Auth Netlogon Stack Overflow on Domain Controllers — HIGH

References

https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-40366

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