CVE-2026-55056
Analyzed
Analyzed - Analysis Complete
Heap-based Buffer Overflow in Microsoft Office
Vulnerability report for CVE-2026-55056, including description, CVSS score, EPSS score, affected products, exploitability, helpful resources, and attack-flow context.
Publication date: 2026-07-14
Last updated on: 2026-07-16
Assigner: Microsoft Corporation
Description
Description
Heap-based buffer overflow in Microsoft Office allows an unauthorized attacker to execute code locally.
CVSS Scores
EPSS Scores
| Probability: | |
| Percentile: |
Meta Information
Affected Vendors & Products
| Vendor | Product | Version / Range |
|---|---|---|
| microsoft | 365_apps | * |
| microsoft | 365_apps | * |
| microsoft | office_2019 | * |
| microsoft | office_2019 | * |
| microsoft | office_2016 | * |
| microsoft | office_2016 | * |
| microsoft | microsoft_365 | * |
| microsoft | office_2021 | * |
| microsoft | office_2021 | * |
| microsoft | office_2021 | * |
| microsoft | office_2024 | * |
| microsoft | office_2024 | * |
| microsoft | office_2024 | * |
Helpful Resources
Exploitability
CWE
KEV
| CWE ID | Description |
|---|---|
| CWE-787 | The product writes data past the end, or before the beginning, of the intended buffer. |
| 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(). |
