Microsoft Windows 11 Version 26H1 vulnerabilities

CVE-2026-34329 [HIGH] CWE-122 CVE-2026-34329: Heap-based buffer overflow in Windows Message Queuing allows an unauthorized attacker to execute cod Heap-based buffer overflow in Windows Message Queuing allows an unauthorized attacker to execute code over an adjacent network.

CVE-2026-40403 [HIGH] CWE-122 CVE-2026-40403: Heap-based buffer overflow in Windows Win32K - GRFX allows an authorized attacker to execute code lo Heap-based buffer overflow in Windows Win32K - GRFX allows an authorized attacker to execute code locally.

CVE-2026-54999 [HIGH] CWE-362 CVE-2026-54999: Concurrent execution using shared resource with improper synchronization ('race condition') in Windo Concurrent execution using shared resource with improper synchronization ('race condition') in Windows TCP/IP allows an unauthorized attacker to execute code over an adjacent network.

CVE-2026-24283 [HIGH] CWE-122 CVE-2026-24283: Heap-based buffer overflow in Windows File Server allows an authorized attacker to elevate privilege Heap-based buffer overflow in Windows File Server allows an authorized attacker to elevate privileges locally.

CVE-2026-50692 [HIGH] CWE-122 CVE-2026-50692: Heap-based buffer overflow in Desktop Window Manager allows an authorized attacker to elevate privil Heap-based buffer overflow in Desktop Window Manager allows an authorized attacker to elevate privileges locally.

CVE-2026-83914 [HIGH] CWE-416 CVE-2026-83914: Use after free in Microsoft XML allows an unauthorized attacker to execute code over a network. Use after free in Microsoft XML allows an unauthorized attacker to execute code over a network.

CVE-2026-105005 [HIGH] CWE-787 CVE-2026-105005: Out-of-bounds write in Windows Schannel allows an unauthorized attacker to execute code over a netwo Out-of-bounds write in Windows Schannel allows an unauthorized attacker to execute code over a network.

CVE-2026-78449 [HIGH] CWE-416 CVE-2026-78449: Use after free in Reliable Multicast Transport Driver (RMCAST) allows an unauthorized attacker to ex Use after free in Reliable Multicast Transport Driver (RMCAST) allows an unauthorized attacker to execute code over a network.

CVE-2026-72981 [HIGH] CWE-416 CVE-2026-72981: Use after free in IP Helper allows an unauthorized attacker to execute code over a network. Use after free in IP Helper allows an unauthorized attacker to execute code over a network.

CVE-2026-69786 [HIGH] CWE-122 CVE-2026-69786: Heap-based buffer overflow in Windows Text Shaping allows an unauthorized attacker to execute code o Heap-based buffer overflow in Windows Text Shaping allows an unauthorized attacker to execute code over a network.

CVE-2026-50686 [HIGH] CWE-843 CVE-2026-50686: Access of resource using incompatible type ('type confusion') in Windows OLE allows an unauthorized Access of resource using incompatible type ('type confusion') in Windows OLE allows an unauthorized attacker to execute code over a network.

CVE-2026-85371 [HIGH] CWE-416 CVE-2026-85371: Use after free in Network Policy Server (NPS) allows an unauthorized attacker to execute code over a Use after free in Network Policy Server (NPS) allows an unauthorized attacker to execute code over a network.

CVE-2026-66802 [HIGH] CWE-362 CVE-2026-66802: Concurrent execution using shared resource with improper synchronization ('race condition') in Windo Concurrent execution using shared resource with improper synchronization ('race condition') in Windows Device Health Attestation (DHA) allows an unauthorized attacker to execute code over a network.

CVE-2026-42980 [HIGH] CWE-122 CVE-2026-42980: Integer underflow (wrap or wraparound) in Windows NT OS Kernel allows an authorized attacker to elev Integer underflow (wrap or wraparound) in Windows NT OS Kernel allows an authorized attacker to elevate privileges locally.

CVE-2026-70207 [HIGH] CWE-122 CVE-2026-70207: Heap-based buffer overflow in Network Policy Server (NPS) allows an authorized attacker to execute c Heap-based buffer overflow in Network Policy Server (NPS) allows an authorized attacker to execute code over a network.

CVE-2026-69514 [HIGH] CWE-122 CVE-2026-69514: Heap-based buffer overflow in Windows Remote Desktop Services allows an authorized attacker to execu Heap-based buffer overflow in Windows Remote Desktop Services allows an authorized attacker to execute code over a network.

CVE-2026-69688 [HIGH] CWE-122 CVE-2026-69688: Heap-based buffer overflow in Windows Encrypting File System (EFS) allows an authorized attacker to Heap-based buffer overflow in Windows Encrypting File System (EFS) allows an authorized attacker to elevate privileges over a network.

CVE-2026-33829 [MEDIUM] CWE-200 CVE-2026-33829: Exposure of sensitive information to an unauthorized actor in Windows Snipping Tool allows an unauth Exposure of sensitive information to an unauthorized actor in Windows Snipping Tool allows an unauthorized attacker to perform spoofing over a network.

CVE-2024-43582 [HIGH] CWE-416 CVE-2024-43582: Remote Desktop Protocol Server Remote Code Execution Vulnerability Remote Desktop Protocol Server Remote Code Execution Vulnerability

CVE-2026-45602 [CRITICAL] CWE-349 CVE-2026-45602: No cwe for this issue in Windows DHCP Server allows an unauthorized attacker to perform tampering ov No cwe for this issue in Windows DHCP Server allows an unauthorized attacker to perform tampering over a network.