CVE-2026-126526: Buffer Overflow
Heap-based buffer overflow in Microsoft Office OneNote allows an unauthorized attacker to execute code over a network.
Other sources
Microsoft Office OneNote Remote Code Execution Vulnerability
— Microsoft
Affected Software
Remediation
Recommended actions to resolve this vulnerability, in priority order.
- Upgrade
Upgrade to a fixed release to a version that resolves this vulnerability.
Fixed in 16.115.26110837 - Upgrade
Upgrade to a fixed release to a version that resolves this vulnerability.
Fixed in 16.0.14334.21048 - Upgrade
Upgrade to a fixed release to a version that resolves this vulnerability.
Fixed in 16.0.17932.21140
Event History
Frequently Asked Questions
What must an attacker do to exploit this vulnerability?
The attacker must persuade a user to interact with malicious content; the vector is network-based, requires user interaction, and does not require attacker privileges.
What impact could successful exploitation have?
Successful exploitation can result in remote code execution, with high impact to confidentiality, integrity, and availability.
Which Office products are identified as affected?
The listed affected products are Microsoft Office LTSC 2021, Microsoft Office LTSC 2024, Microsoft Office LTSC for Mac 2021, Microsoft Office 365 for Mac, and Microsoft Office LTSC for Mac 2024.