Heap-based buffer overflow in Microsoft Office - CVE-2026-70269
Published: October 14, 2026
Vulnerability identifier: #VU154694
CSH Severity: High
CVSS v4: 9.2 [CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-70269
CWE-ID: CWE-122
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote attacker to execute arbitrary code.
The vulnerability exists due to a heap-based buffer overflow in Microsoft Office Word when handling content through the Preview Pane. A remote attacker can trigger the buffer overflow over a network to execute arbitrary code.
Successful exploitation requires a deep understanding of the system and the ability to manipulate its components to trigger a specific condition. Success depends on factors that may include the environment, system configuration, and additional security measures.
Affected software
Microsoft Office
How to mitigate CVE-2026-70269
Install security update from vendor's website.
Microsoft Office - addressed in versions 16.0.14334.20974, 16.0.17932.21056