Microsoft Access/Office buffer overflow

Summaryinfo

A vulnerability categorized as problematic has been discovered in Microsoft Access and Office. This vulnerability affects unknown code. Executing a manipulation can lead to buffer overflow. This vulnerability is tracked as CVE-2026-64914. The attack is restricted to local execution. No exploit exists.

Detailsinfo

A vulnerability has been found in Microsoft Access and Office (affected version unknown) and classified as problematic. This vulnerability affects an unknown functionality. 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:

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

The advisory is shared for download at msrc.microsoft.com. This vulnerability was named CVE-2026-64914 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 334625 (Security Updates for Microsoft Access 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 (334625). Once again VulDB remains the best source for vulnerability data.

Productinfo

Type

• Database Software

Vendor

• Microsoft

Name

• Access
• 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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