7.8
High
CVE-2026-55017 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 → < 16.0.5561.1000 | 16.0.5561.1000 |
| 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 |
Other CVEs of Microsoft 365 Apps for Enterprise
The 931 CVEs of Microsoft 365 Apps for Enterprise →
CVE-2026-108455
Out-of-bounds read in Microsoft Office PowerPoint allows an unauthorized attacker to disclose information over a network
6.5
Medium
CVE-2026-108454
Buffer over-read in Microsoft Office PowerPoint allows an unauthorized attacker to disclose information over a network
6.5
Medium
CVE-2026-108453
Out-of-bounds read in Microsoft Office PowerPoint allows an unauthorized attacker to disclose information over a network
6.5
Medium
CVE-2026-108451
Numeric truncation error in Microsoft Office Word allows an unauthorized attacker to execute code over a network
8.8
High