Microsoft Office Word buffer overflow

Summaryinfo

A vulnerability, which was classified as problematic, has been found in Microsoft Office. Affected is an unknown function of the component Word. This manipulation causes buffer overflow. This vulnerability appears as CVE-2026-55130. The attack requires local access. There is no available exploit.

Detailsinfo

A vulnerability classified as problematic was found in Microsoft Office (affected version unknown). Affected by this vulnerability is an unknown functionality of the component Word. 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. The summary by CVE is:

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

It is possible to read the advisory at msrc.microsoft.com. This vulnerability is known as CVE-2026-55130 since 06/16/2026. The exploitation appears to be easy. Attacking locally is a requirement. It demands that the victim is doing some kind of user interaction. The technical details are unknown and an exploit is not publicly available. The pricing for an exploit might be around 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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