8.4
High
CVE-2026-40358 Heap-based buffer overflow in Microsoft Office allows an unauthorized attacker to execute code locally
Description
Heap-based buffer overflow in Microsoft Office allows an unauthorized attacker to execute code locally.
Affected products and versions
| Product | Affected versions | Fixed in |
|---|---|---|
| Microsoft 365 Apps for Enterprise 16.0 | 16.0.1 → latest | No fix stated |
| Microsoft Office 2016 16.0 | 16.0.0 → < 16.0.5552.1000 | 16.0.5552.1000 |
| Microsoft Office 2019 19.0 | 19.0.0 → latest | No fix stated |
| Microsoft Office LTSC 2021 16.0 | 16.0.1 → latest | No fix stated |
| Microsoft Office LTSC 2024 16.0 | 16.0.0 → latest | No fix stated |
| Microsoft Office LTSC for Mac 2021 16.0 | 16.0.1 → < 16.109.26051019 | 16.109.26051019 |
| Microsoft Office LTSC for Mac 2024 16.0 | 16.0.0 → < 16.109.26051019 | 16.109.26051019 |
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8.8
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