CVE-2026-55134
High
Description
Stack-based buffer overflow in Microsoft Office Word allows an unauthorized attacker to execute code locally.
SeverityHigh
CVSS7.8
Exploit probability—
Product
Microsoft 365
PublishedJul 14, 2026
First seenJul 14, 2026
Weakness typeCWE-121CWE-121
How to fix
Update
- microsoft sharepoint_server16.0.19725.20434 or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| microsoft microsoft_365 | No range specified | — |
| microsoft 365_apps | No range specified | — |
| microsoft office_2019 | No range specified | — |
| microsoft office_2021 | No range specified | — |
| microsoft office_2024 | No range specified | — |
| microsoft sharepoint_server | v < 16.0.19725.20434, 2016, 2019 | 16.0.19725.20434 |
| microsoft word | 2016 | — |
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