Advisoriesby IbisMicrosoftCVE-2026-69556
Microsoft Office Word: heap buffer overflow
Fix: upgrade to 16.113.26091433 or later (2 fixed versions below)
Heap-based buffer overflow in Microsoft Office Word allows an unauthorized attacker to execute code over a network.
Affected versions
| Package | Affected | Fixed in |
|---|---|---|
| Microsoft 365 Apps for Enterprise Product | >= 16.0.1, < https://aka.ms/OfficeSecurityReleases | https://aka.ms/OfficeSecurityReleases |
| Microsoft Office 2019 Product | >= 19.0.0, < https://aka.ms/OfficeSecurityReleases | https://aka.ms/OfficeSecurityReleases |
| Microsoft Office 365 for Mac Product | >= 1.0.0, < 16.113.26091433 | 16.113.26091433 |
| Microsoft Office LTSC 2021 Product | >= 16.0.1, < https://aka.ms/OfficeSecurityReleases | https://aka.ms/OfficeSecurityReleases |
| Microsoft Office LTSC 2024 Product | >= 16.0.0, < https://aka.ms/OfficeSecurityReleases | https://aka.ms/OfficeSecurityReleases |
| Microsoft Office LTSC for Mac 2021 Product | >= 16.0.1, < 16.113.26091433 | 16.113.26091433 |
| Microsoft Office LTSC for Mac 2024 Product | >= 16.0.0, < 16.113.26091433 | 16.113.26091433 |
| Microsoft Word 2016 Product | >= 16.0.1, < 16.0.5569.1002 | 16.0.5569.1002 |
Changes since it was listed
Fixed in: Microsoft 365 Apps for Enterprise https://aka.ms/OfficeSecurityReleases, Microsoft Office 2019 https://aka.ms/OfficeSecu to Microsoft 365 Apps for Enterprise https://aka.ms/OfficeSecurityReleases, Microsoft Office 2019 https://aka.ms/OfficeSecurityReleases, Microsoft Office 365 for M
Details and references
- CVSS 3.1
- CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
- Severity from
- the vendor (its own CVE record or advisory)
- Weakness
- CWE-122