Advisoriesby IbisMicrosoftCVE-2026-69594
Microsoft Windows: heap buffer overflow
Fix: upgrade to 10.0.26100.9445 or later (4 fixed versions below)
Heap-based buffer overflow in Microsoft Local Security Authority Server (lsasrv) allows an authorized attacker to elevate privileges locally.
Affected versions
| Package | Affected | Fixed in |
|---|---|---|
| Windows 11 Version 24H2 Product | >= 10.0.26100.0, < 10.0.26100.9445 | 10.0.26100.9445 |
| Windows 11 Version 25H2 Product | >= 10.0.26200.0, < 10.0.26200.9445 | 10.0.26200.9445 |
| Windows 11 version 26H1 Product | >= 10.0.28000.0, < 10.0.28000.2954 | 10.0.28000.2954 |
| Windows Server 2025 Product | >= 10.0.26100.0, < 10.0.26100.33438 | 10.0.26100.33438 |
| Windows Server 2025 (Server Core installation) Product | >= 10.0.26100.0, < 10.0.26100.33438 | 10.0.26100.33438 |