CVE-2026-64909

Microsoft Office Remote Code Execution Vulnerability

CVE-2026-64909 is fixed in 2 products on 1 platform, first by KB5002897, released August 11, 2026. It is not reported as exploited. Patch Radar priority: Urgent.

Urgent

CVSS

7.8

Critical

Exploitation

None reported

Exploitation Less Likely

CISA KEV

Not listed

Not in the Known Exploited Vulnerabilities catalog

EPSS

0.0047

40th percentile

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

Where it's fixed

Product	Fix	Released
Microsoft
Microsoft Office 2016 (32-bit edition)	KB5002897	Aug 11, 2026
Microsoft Office 2016 (64-bit edition)	KB5002897	Aug 11, 2026

Details

Published
August 11, 2026
Weakness
Integer Underflow (Wrap or Wraparound)
Vendor advisory
https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-64909

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