Microsoft Office heap-based overflow

Summaryinfo

A vulnerability labeled as problematic has been found in Microsoft Office. Impacted is an unknown function. Such manipulation leads to heap-based overflow. This vulnerability is listed as CVE-2026-55125. The attack must be carried out locally. There is no available exploit.

Detailsinfo

A vulnerability was found in Microsoft Office (the affected version unknown) and classified as problematic. Affected by this issue is an unknown part. The manipulation with an unknown input leads to a heap-based overflow vulnerability. Using CWE to declare the problem leads to CWE-122. 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(). Impacted is confidentiality, integrity, and availability. CVE summarizes:

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

The advisory is available at msrc.microsoft.com. This vulnerability is handled as CVE-2026-55125 since 06/16/2026. The exploitation is known to be easy. Local access is required to approach this attack. Successful exploitation requires user interaction by the victim. The technical details are unknown and an exploit is not available. The structure of the vulnerability defines a possible price range of USD $5k-$25k at the moment (estimation calculated on 07/15/2026).

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

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Productinfo

Type

• Office Suite Software

Vendor

• Microsoft

Name

• Office

License

• commercial

Website

• Vendor: https://www.microsoft.com/

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