Microsoft Windows 11 26H1 vulnerabilities

CVE-2026-42984 [HIGH] CWE-416 CVE-2026-42984: Use after free in Windows Kernel allows an authorized attacker to elevate privileges locally. Use after free in Windows Kernel allows an authorized attacker to elevate privileges locally.

CVE-2026-56173 [HIGH] CWE-416 CVE-2026-56173: Use after free in Windows WebView allows an authorized attacker to elevate privileges locally. Use after free in Windows WebView allows an authorized attacker to elevate privileges locally.

CVE-2026-58629 [HIGH] CWE-416 CVE-2026-58629: Use after free in Windows DirectX allows an authorized attacker to elevate privileges locally. Use after free in Windows DirectX allows an authorized attacker to elevate privileges locally.

CVE-2026-50397 [HIGH] CWE-416 CVE-2026-50397: Use after free in Windows Kernel allows an authorized attacker to elevate privileges locally. Use after free in Windows Kernel allows an authorized attacker to elevate privileges locally.

CVE-2026-56186 [MEDIUM] CWE-125 CVE-2026-56186: Out-of-bounds read in Windows Schannel allows an authorized attacker to disclose information over a Out-of-bounds read in Windows Schannel allows an authorized attacker to disclose information over a network.

CVE-2026-50376 [MEDIUM] CWE-908 CVE-2026-50376: Use of uninitialized resource in Windows RDP allows an unauthorized attacker to disclose information Use of uninitialized resource in Windows RDP allows an unauthorized attacker to disclose information over a network.

CVE-2026-32151 [MEDIUM] CWE-200 CVE-2026-32151: Exposure of sensitive information to an unauthorized actor in Windows Shell allows an authorized att Exposure of sensitive information to an unauthorized actor in Windows Shell allows an authorized attacker to disclose information over a network.

CVE-2026-50432 [MEDIUM] CWE-416 CVE-2026-50432: Use after free in Windows Virtual Filtering Platform (VFP) allows an authorized attacker to deny ser Use after free in Windows Virtual Filtering Platform (VFP) allows an authorized attacker to deny service over a network.

CVE-2026-40413 [HIGH] CWE-476 CVE-2026-40413: Null pointer dereference in Windows TCP/IP allows an unauthorized attacker to deny service over an a Null pointer dereference in Windows TCP/IP allows an unauthorized attacker to deny service over an adjacent network.

CVE-2026-41097 [MEDIUM] CWE-1329 CVE-2026-41097: Reliance on a component that is not updateable in Windows Secure Boot allows an authorized attacker Reliance on a component that is not updateable in Windows Secure Boot allows an authorized attacker to bypass a security feature locally.

CVE-2026-25179 [HIGH] CWE-1287 CVE-2026-25179: Improper validation of specified type of input in Windows Ancillary Function Driver for WinSock allo Improper validation of specified type of input in Windows Ancillary Function Driver for WinSock allows an authorized attacker to elevate privileges locally.

CVE-2026-32070 [HIGH] CWE-416 CVE-2026-32070: Use after free in Windows Common Log File System Driver allows an authorized attacker to elevate pri Use after free in Windows Common Log File System Driver allows an authorized attacker to elevate privileges locally.

CVE-2026-34342 [HIGH] CWE-362 CVE-2026-34342: Concurrent execution using shared resource with improper synchronization ('race condition') in Windo Concurrent execution using shared resource with improper synchronization ('race condition') in Windows Print Spooler Components allows an authorized attacker to elevate privileges locally.

CVE-2026-25178 [HIGH] CWE-416 CVE-2026-25178: Use after free in Windows Ancillary Function Driver for WinSock allows an authorized attacker to ele Use after free in Windows Ancillary Function Driver for WinSock allows an authorized attacker to elevate privileges locally.

CVE-2026-26165 [HIGH] CWE-416 CVE-2026-26165: Use after free in Windows Shell allows an authorized attacker to elevate privileges locally. Use after free in Windows Shell allows an authorized attacker to elevate privileges locally.

CVE-2026-56183 [HIGH] CWE-416 CVE-2026-56183: Use after free in Windows MIDI Service Module allows an authorized attacker to elevate privileges lo Use after free in Windows MIDI Service Module allows an authorized attacker to elevate privileges locally.

CVE-2026-40410 [HIGH] CWE-416 CVE-2026-40410: Use after free in Windows SMB Client allows an authorized attacker to elevate privileges locally. Use after free in Windows SMB Client allows an authorized attacker to elevate privileges locally.

CVE-2026-42911 [HIGH] CWE-416 CVE-2026-42911: Use after free in Windows Ancillary Function Driver for WinSock allows an authorized attacker to ele Use after free in Windows Ancillary Function Driver for WinSock allows an authorized attacker to elevate privileges locally.

CVE-2026-34335 [HIGH] CWE-416 CVE-2026-34335: Use after free in Windows Ancillary Function Driver for WinSock allows an authorized attacker to ele Use after free in Windows Ancillary Function Driver for WinSock allows an authorized attacker to elevate privileges locally.

CVE-2026-58637 [HIGH] CWE-416 CVE-2026-58637: Use after free in Windows Client-Side Caching (CSC) Service allows an authorized attacker to elevate Use after free in Windows Client-Side Caching (CSC) Service allows an authorized attacker to elevate privileges locally.