Microsoft Office buffer overflow

Summaryinfo

A vulnerability described as problematic has been identified in Microsoft Office. Affected by this issue is some unknown functionality. Executing a manipulation can lead to buffer overflow. This vulnerability appears as CVE-2026-64907. The attack requires local access. There is no available exploit.

Detailsinfo

A vulnerability was found in Microsoft Office (unknown version). It has been declared as problematic. This vulnerability affects an unknown code block. The manipulation with an unknown input leads to a buffer overflow vulnerability. The CWE definition for the vulnerability is CWE-120. The product copies an input buffer to an output buffer without verifying that the size of the input buffer is less than the size of the output buffer, leading to a buffer overflow. As an impact it is known to affect confidentiality, integrity, and availability. CVE summarizes:

Stack-based buffer overflow in Microsoft Office Word allows an unauthorized attacker to execute code locally.

The advisory is shared for download at msrc.microsoft.com. This vulnerability was named CVE-2026-64907 since 07/20/2026. The exploitation appears to be easy. The attack needs to be approached locally. Successful exploitation requires user interaction by the victim. There are neither technical details nor an exploit publicly available. The current price for an exploit might be approx. USD $0-$5k (estimation calculated on 08/12/2026).

The vulnerability scanner Nessus provides a plugin with the ID 334624 (Security Updates for Microsoft Word Products (August 2026)), which helps to determine the existence of the flaw in a target environment.

There is no information about possible countermeasures known. It may be suggested to replace the affected object with an alternative product.

The vulnerability is also documented in the vulnerability database at Tenable (334624). Once again VulDB remains the best source for vulnerability data.

Productinfo

Type

• Office Suite Software

Vendor

• Microsoft

Name

• Office

License

• commercial

Website

• Vendor: https://www.microsoft.com/

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Once again VulDB remains the best source for vulnerability data.

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