CVE-2026-56194
Analyzed
Analyzed - Analysis Complete
Heap-based Buffer Overflow in Windows Network File System
Vulnerability report for CVE-2026-56194, including description, CVSS score, EPSS score, affected products, exploitability, helpful resources, and attack-flow context.
Publication date: 2026-07-14
Last updated on: 2026-07-22
Assigner: Microsoft Corporation
Description
Description
Heap-based buffer overflow in Windows Network File System allows an authorized attacker to elevate privileges over a network.
CVSS Scores
EPSS Scores
| Probability: | |
| Percentile: |
Meta Information
Affected Vendors & Products
| Vendor | Product | Version / Range |
|---|---|---|
| microsoft | windows_server_2012 | r2 |
| microsoft | windows_server_2012 | * |
| microsoft | windows_10_1607 | to 10.0.14393.9339 (exc) |
| microsoft | windows_10_1607 | to 10.0.14393.9339 (exc) |
| microsoft | windows_10_1809 | to 10.0.17763.9020 (exc) |
| microsoft | windows_10_1809 | to 10.0.17763.9020 (exc) |
| microsoft | windows_server_2016 | to 10.0.14393.9339 (exc) |
| microsoft | windows_server_2019 | to 10.0.17763.9020 (exc) |
| microsoft | windows_server_2022 | to 10.0.20348.5386 (exc) |
| microsoft | windows_server_2025 | to 10.0.26100.33158 (exc) |
| microsoft | windows_10_21h2 | to 10.0.19044.7548 (exc) |
| microsoft | windows_10_22h2 | to 10.0.19045.7548 (exc) |
| microsoft | windows_11_24h2 | to 10.0.26100.8875 (exc) |
| microsoft | windows_11_26h1 | to 10.0.28000.2525 (exc) |
| microsoft | windows_11_25h2 | to 10.0.26200.8875 (exc) |
Helpful Resources
Exploitability
CWE
KEV
| CWE ID | Description |
|---|---|
| CWE-190 | The product performs a calculation that can produce an integer overflow or wraparound when the logic assumes that the resulting value will always be larger than the original value. This occurs when an integer value is incremented to a value that is too large to store in the associated representation. When this occurs, the value may become a very small or negative number. |
| 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(). |
