7.8
High
CVE-2026-20810 Free of memory not on the heap in Windows Ancillary Function Driver for WinSock allows an authorized attacker to elevate…
Description
Free of memory not on the heap in Windows Ancillary Function Driver for WinSock allows an authorized attacker to elevate privileges locally.
Affected products and versions
| Product | Affected versions | Fixed in |
|---|---|---|
| Windows 10 Version 1809 10.0 | 10.0.17763.0 → < 10.0.17763.8276 | 10.0.17763.8276 |
| Windows Server 2019 10.0 | 10.0.17763.0 → < 10.0.17763.8276 | 10.0.17763.8276 |
| Windows Server 2019 (Server Core installation) 10.0 | 10.0.17763.0 → < 10.0.17763.8276 | 10.0.17763.8276 |
| Windows 10 Version 21H2 10.0 | 10.0.19044.0 → < 10.0.19044.6809 | 10.0.19044.6809 |
| Windows 10 Version 22H2 10.0 | 10.0.19045.0 → < 10.0.19045.6809 | 10.0.19045.6809 |
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