CVE-2026-64909

—

CVSS 3.1

7.8 high

EPSS

<1%p27

Published

Aug 11, 2026 (Aug 11, 2026)

Modified

Aug 14, 2026

Description

Integer underflow (wrap or wraparound) in Microsoft Office allows an unauthorized attacker to execute code locally.

Vendors: microsoft
Products: 365 apps, microsoft 365, office 2016, office 2019, office 2021, office 2024
Weakness: CWE-122, CWE-125, CWE-191
Vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

NVD CVE.org GitHub PoCs EPSS (0.3%)

In the news0 stories

No ingested article mentions this CVE yet.