CVE-2026-69777: Microsoft Windows 11 24h2

High severity, CVSS 8.0. EPSS: 0.6% chance of exploitation in the next 30 days.

Heap-based buffer overflow in Windows DHCP Client allows an authorized attacker to elevate privileges over an adjacent network.

Affected products

• Microsoft Windows 11 24h2: before 10.0.26100.9445 (fixed in 10.0.26100.9445)
• Microsoft Windows 11 25h2: before 10.0.26200.9445 (fixed in 10.0.26200.9445)
• Microsoft Windows 11 26h1: before 10.0.28000.2954 (fixed in 10.0.28000.2954)

Published 2026-09-08. Last modified 2026-09-11.