Jul 2026: Microsoft Word Remote Code Execution Vulnerability
CVE-2026-55033 Published on July 14, 2026

Microsoft Word Remote Code Execution Vulnerability
Integer overflow or wraparound in Microsoft Office Word allows an unauthorized attacker to execute code locally.

Vendor Advisory NVD

Weakness Types

Integer Overflow or Wraparound

The software performs a calculation that can produce an integer overflow or wraparound, when the logic assumes that the resulting value will always be larger than the original value. This can introduce other weaknesses when the calculation is used for resource management or execution control. An integer overflow or wraparound occurs when an integer value is incremented to a value that is too large to store in the associated representation. When this occurs, the value may wrap to become a very small or negative number. While this may be intended behavior in circumstances that rely on wrapping, it can have security consequences if the wrap is unexpected. This is especially the case if the integer overflow can be triggered using user-supplied inputs. This becomes security-critical when the result is used to control looping, make a security decision, or determine the offset or size in behaviors such as memory allocation, copying, concatenation, etc.

Heap-based Buffer Overflow

A heap overflow condition is a buffer overflow, where the buffer that can be overwritten is allocated in the heap portion of memory, generally meaning that the buffer was allocated using a routine such as malloc().


Products Associated with CVE-2026-55033

Want to know whenever a new CVE is published for Microsoft products? stack.watch will email you.

Microsoft Sharepoint Server 2019
 
Microsoft Office 2019
 
Microsoft 365 Apps
 
Microsoft Office Macos 2021
 
Microsoft Office 2021
 
Microsoft Office 2024
 
Microsoft Office Macos 2024
 
Microsoft Word 2016
 
Microsoft Sharepoint Server 2016
 
Microsoft Sharepoint Server
 
Microsoft Office 365
 

Affected Versions

Microsoft 365 Apps for Enterprise: Microsoft Office 2019: Microsoft Office 365 for Mac: Microsoft Office LTSC 2021: Microsoft Office LTSC 2024: Microsoft Office LTSC for Mac 2021: Microsoft Office LTSC for Mac 2024: Microsoft SharePoint Enterprise Server 2016: Microsoft SharePoint Server 2019: Microsoft SharePoint Server Subscription Edition: Microsoft Word 2016: