Stack-based buffer overflow in Microsoft products - CVE-2026-55134

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Main Vulnerability Database Vulnerabilities #VU138234

Stack-based buffer overflow in Microsoft products - CVE-2026-55134

Published: July 17, 2026


Vulnerability identifier: #VU138234
CSH Severity: High
CVSS v4.0: CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:A/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:U/U:Amber
CVE-ID: CVE-2026-55134
CWE-ID: CWE-121
Exploitation vector: Remote access
Exploit availability: No public exploit available
Vendor: Microsoft
Affected software:
Microsoft Office for macOS
Microsoft Word
Microsoft SharePoint Server

Detailed vulnerability description

The vulnerability allows a remote attacker to execute arbitrary code.

The vulnerability exists due to stack-based buffer overflow in Microsoft Office Word when parsing a crafted Office file. A remote attacker can send a specially crafted file and trick the victim into opening it to execute arbitrary code.

The Preview Pane is not an attack vector.


How to mitigate CVE-2026-55134

Install security update from vendor's website.

Sources