Microsoft Windows 11 Version 26H1 vulnerabilities

CVE-2026-56194 [HIGH] CWE-122 CVE-2026-56194: Heap-based buffer overflow in Windows Network File System allows an authorized attacker to elevate p Heap-based buffer overflow in Windows Network File System allows an authorized attacker to elevate privileges over a network.

CVE-2026-56647 [HIGH] CWE-190 CVE-2026-56647: Integer overflow or wraparound in Windows Remote Access Service Infrastructure allows an authorized Integer overflow or wraparound in Windows Remote Access Service Infrastructure allows an authorized attacker to elevate privileges over a network.

CVE-2026-57092 [CRITICAL] CWE-416 CVE-2026-57092: Use after free in Windows VMSwitch allows an authorized attacker to elevate privileges over a networ Use after free in Windows VMSwitch allows an authorized attacker to elevate privileges over a network.

CVE-2026-57090 [CRITICAL] CWE-122 CVE-2026-57090: Heap-based buffer overflow in Microsoft Windows Media Foundation allows an unauthorized attacker to Heap-based buffer overflow in Microsoft Windows Media Foundation allows an unauthorized attacker to execute code over a network.

CVE-2026-49172 [CRITICAL] CWE-122 CVE-2026-49172: Heap-based buffer overflow in Windows FTP Service allows an unauthorized attacker to execute code ov Heap-based buffer overflow in Windows FTP Service allows an unauthorized attacker to execute code over a network.

CVE-2026-54995 [CRITICAL] CWE-416 CVE-2026-54995: 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-2026-50666 [HIGH] CWE-416 CVE-2026-50666: Use after free in Windows Remote Access Connection Manager allows an authorized attacker to elevate Use after free in Windows Remote Access Connection Manager allows an authorized attacker to elevate privileges over a network.

CVE-2026-50360 [HIGH] CWE-303 CVE-2026-50360: Incorrect implementation of authentication algorithm in Windows SMB Server allows an authorized atta Incorrect implementation of authentication algorithm in Windows SMB Server allows an authorized attacker to elevate privileges over a network.

CVE-2026-25177 [HIGH] CWE-641 CVE-2026-25177: Improper restriction of names for files and other resources in Active Directory Domain Services allo Improper restriction of names for files and other resources in Active Directory Domain Services allows an authorized attacker to elevate privileges over a network.

CVE-2026-58626 [HIGH] CWE-416 CVE-2026-58626: Use after free in Windows Remote Desktop Services allows an authorized attacker to execute code over Use after free in Windows Remote Desktop Services allows an authorized attacker to execute code over a network.

CVE-2026-50502 [HIGH] CWE-1220 CVE-2026-50502: Insufficient granularity of access control in Windows Event Logging Service allows an authorized att Insufficient granularity of access control in Windows Event Logging Service allows an authorized attacker to execute code over a network.

CVE-2026-50447 [CRITICAL] CWE-122 CVE-2026-50447: 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 a network.

CVE-2026-58594 [CRITICAL] CWE-190 CVE-2026-58594: Integer overflow or wraparound in Windows RDP allows an unauthorized attacker to execute code over a Integer overflow or wraparound in Windows RDP allows an unauthorized attacker to execute code over a network.

CVE-2026-42990 [CRITICAL] CWE-122 CVE-2026-42990: Heap-based buffer overflow in SQL Server ODBC driver allows an unauthorized attacker to execute code Heap-based buffer overflow in SQL Server ODBC driver allows an unauthorized attacker to execute code over a network.

CVE-2026-57089 [CRITICAL] CWE-416 CVE-2026-57089: Use after free in Windows SMB Server Network Transport Driver (srvnet.sys) allows an unauthorized at Use after free in Windows SMB Server Network Transport Driver (srvnet.sys) allows an unauthorized attacker to execute code over a network.

CVE-2026-23669 [HIGH] CWE-416 CVE-2026-23669: Use after free in RPC Runtime allows an authorized attacker to execute code over a network. Use after free in RPC Runtime allows an authorized attacker to execute code over a network.

CVE-2026-50369 [HIGH] CWE-362 CVE-2026-50369: Use after free in Windows Remote Desktop Services allows an authorized attacker to elevate privilege Use after free in Windows Remote Desktop Services allows an authorized attacker to elevate privileges over a network.

CVE-2026-56190 [CRITICAL] CWE-908 CVE-2026-56190: Use of uninitialized resource in Windows RDP allows an unauthorized attacker to execute code over a Use of uninitialized resource in Windows RDP allows an unauthorized attacker to execute code over a network.

CVE-2026-50694 [CRITICAL] CWE-416 CVE-2026-50694: Use after free in Windows Secure Socket Tunneling Protocol (SSTP) allows an unauthorized attacker to Use after free in Windows Secure Socket Tunneling Protocol (SSTP) allows an unauthorized attacker to execute code over a network.

CVE-2026-49178 [HIGH] CWE-122 CVE-2026-49178: Heap-based buffer overflow in Active Directory Domain Services allows an authorized attacker to exec Heap-based buffer overflow in Active Directory Domain Services allows an authorized attacker to execute code over a network.