CVE-2026-34344
Analyzed
Analyzed - Analysis Complete
BaseFortify
Publication date: 2026-05-12
Last updated on: 2026-05-14
Assigner: Microsoft Corporation
Description
Description
Access of resource using incompatible type ('type confusion') in Windows Ancillary Function Driver for WinSock allows an authorized attacker to elevate privileges locally.
CVSS Scores
EPSS Scores
| Probability: | |
| Percentile: |
Meta Information
Affected Vendors & Products
| Vendor | Product | Version / Range |
|---|---|---|
| microsoft | windows_10_1607 | to 10.0.14393.9140 (exc) |
| microsoft | windows_10_1809 | to 10.0.17763.8755 (exc) |
| microsoft | windows_10_21h2 | to 10.0.19044.7291 (exc) |
| microsoft | windows_10_22h2 | to 10.0.19045.7291 (exc) |
| microsoft | windows_11_23h2 | to 10.0.22631.7079 (exc) |
| microsoft | windows_11_24h2 | to 10.0.26100.8390 (exc) |
| microsoft | windows_11_25h2 | to 10.0.26200.8390 (exc) |
| microsoft | windows_11_26h1 | to 10.0.28000.2113 (exc) |
| microsoft | windows_server_2012 | * |
| microsoft | windows_server_2012 | r2 |
| microsoft | windows_server_2016 | to 10.0.14393.9140 (exc) |
| microsoft | windows_server_2019 | to 10.0.17763.8755 (exc) |
| microsoft | windows_server_2022 | to 10.0.20348.5074 (exc) |
| microsoft | windows_server_2022_23h2 | to 10.0.25398.2330 (exc) |
| microsoft | windows_server_2025 | to 10.0.26100.32772 (exc) |
Helpful Resources
Exploitability
CWE
KEV
| CWE ID | Description |
|---|---|
| CWE-843 | The product allocates or initializes a resource such as a pointer, object, or variable using one type, but it later accesses that resource using a type that is incompatible with the original type. |
Attack-Flow Graph
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