HIGH
Microsoft Office Remote Code Execution Vulnerability
Published Aug 11, 2026
7.8
HIGHCVSS 3.1
EPSS 0.47%
Description
Integer underflow (wrap or wraparound) in Microsoft Office allows an unauthorized attacker to execute code locally.
Affected products
-
- Version 16.0.1StatusaffectedConstraints<https://aka.ms/OfficeSecurityReleases
- Version
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- Version 16.0.0StatusaffectedConstraints<16.0.5565.1001
- Version
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- Version 19.0.0StatusaffectedConstraints<https://aka.ms/OfficeSecurityReleases
- Version
-
- Version 1.0.0StatusaffectedConstraints<16.112.26081010
- Version
-
- Version 16.0.1StatusaffectedConstraints<https://aka.ms/OfficeSecurityReleases
- Version
-
- Version 16.0.0StatusaffectedConstraints<https://aka.ms/OfficeSecurityReleases
- Version
-
- Version 16.0.1StatusaffectedConstraints<16.112.26081010
- Version
-
- Version 16.0.0StatusaffectedConstraints<16.112.26081010
- Version
Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).
| Vendor | Product | Default status | Versions | ||||||
|---|---|---|---|---|---|---|---|---|---|
| Microsoft | Microsoft 365 Apps for Enterprise | n/a |
| ||||||
| Microsoft | Microsoft Office 2016 | n/a |
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| Microsoft | Microsoft Office 2019 | n/a |
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| Microsoft | Microsoft Office 365 for Mac | n/a |
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| Microsoft | Microsoft Office LTSC 2021 | n/a |
| ||||||
| Microsoft | Microsoft Office LTSC 2024 | n/a |
| ||||||
| Microsoft | Microsoft Office LTSC for Mac 2021 | n/a |
| ||||||
| Microsoft | Microsoft Office LTSC for Mac 2024 | n/a |
|
OR
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- n/a
- n/a
- n/a
- n/a
- n/a
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No data.
No Red Hat product state for this CVE.
No package ranges for this CVE.
Remediation
No remediation recorded yet.
Weaknesses (3)
References (1)
- https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-64909 vendor-advisorypatchVendor Advisory
| Link | Providers | Tags |
|---|---|---|
| https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-64909 | vendor-advisorypatchVendor Advisory |
Change history (0)
No recorded changes yet.
Sources
CVE.org / MITRE
Status PUBLISHED
Assigner microsoft
Published Aug 11, 2026
Updated Sep 29, 2026
Reserved Jul 20, 2026
Link CVE-2026-64909
CISA Vulnrichment
Updated Aug 11, 2026