Microsoft Word stack-based overflow

Summaryinfo

A vulnerability was found in Microsoft Word. It has been classified as problematic. This vulnerability affects unknown code. The manipulation leads to stack-based overflow. This vulnerability is uniquely identified as CVE-2026-55134. Local access is required to approach this attack. No exploit exists.

Detailsinfo

A vulnerability was found in Microsoft Word (unknown version) and classified as problematic. This issue affects an unknown code block. The manipulation with an unknown input leads to a stack-based overflow vulnerability. Using CWE to declare the problem leads to CWE-121. A stack-based buffer overflow condition is a condition where the buffer being overwritten is allocated on the stack (i.e., is a local variable or, rarely, a parameter to a function). Impacted is confidentiality, integrity, and availability. The summary by CVE is:

Stack-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. The identification of this vulnerability is CVE-2026-55134 since 06/16/2026. The exploitation is known to be easy. Attacking locally is a requirement. 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

• Word Processing Software

Vendor

• Microsoft

Name

• Word

License

• commercial

Website

• Vendor: https://www.microsoft.com/

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