Microsoft Windows 11 Version 26H1 vulnerabilities

CVE-2026-85799 [HIGH] CWE-416 CVE-2026-85799: 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-2026-56188 [HIGH] CWE-362 CVE-2026-56188: Concurrent execution using shared resource with improper synchronization ('race condition') in Windo Concurrent execution using shared resource with improper synchronization ('race condition') in Windows Server Network driver allows an unauthorized attacker to execute code over a network.

CVE-2026-45635 [HIGH] CWE-843 CVE-2026-45635: Access of resource using incompatible type ('type confusion') in Universal Plug and Play (upnp.dll) Access of resource using incompatible type ('type confusion') in Universal Plug and Play (upnp.dll) allows an unauthorized attacker to execute code over a network.

CVE-2026-45599 [HIGH] CWE-416 CVE-2026-45599: Use after free in Universal Plug and Play (upnp.dll) allows an unauthorized attacker to execute code Use after free in Universal Plug and Play (upnp.dll) allows an unauthorized attacker to execute code over a network.

CVE-2026-68834 [HIGH] CWE-121 CVE-2026-68834: Stack-based buffer overflow in Windows NTFS allows an authorized attacker to elevate privileges over Stack-based buffer overflow in Windows NTFS allows an authorized attacker to elevate privileges over a network.

CVE-2026-68838 [HIGH] CWE-121 CVE-2026-68838: Stack-based buffer overflow in Windows NTFS allows an authorized attacker to elevate privileges over Stack-based buffer overflow in Windows NTFS allows an authorized attacker to elevate privileges over a network.

CVE-2026-68880 [HIGH] CWE-122 CVE-2026-68880: Heap-based buffer overflow in Windows Win32K allows an authorized attacker to elevate privileges ove Heap-based buffer overflow in Windows Win32K allows an authorized attacker to elevate privileges over a network.

CVE-2026-68878 [HIGH] CWE-121 CVE-2026-68878: Stack-based buffer overflow in Windows Fast FAT Driver allows an authorized attacker to elevate priv Stack-based buffer overflow in Windows Fast FAT Driver allows an authorized attacker to elevate privileges over a network.

CVE-2026-69875 [HIGH] CWE-122 CVE-2026-69875: Heap-based buffer overflow in Windows NTFS allows an authorized attacker to elevate privileges over Heap-based buffer overflow in Windows NTFS allows an authorized attacker to elevate privileges over a network.

CVE-2026-69481 [HIGH] CWE-122 CVE-2026-69481: Heap-based buffer overflow in Windows Enterprise App Management allows an authorized attacker to ele Heap-based buffer overflow in Windows Enterprise App Management allows an authorized attacker to elevate privileges over a network.

CVE-2026-69503 [HIGH] CWE-121 CVE-2026-69503: Stack-based buffer overflow in Windows USB Driver allows an authorized attacker to elevate privilege Stack-based buffer overflow in Windows USB Driver allows an authorized attacker to elevate privileges over a network.

CVE-2026-69301 [HIGH] CWE-121 CVE-2026-69301: Stack-based buffer overflow in Windows Win32K allows an authorized attacker to elevate privileges ov Stack-based buffer overflow in Windows Win32K allows an authorized attacker to elevate privileges over a network.

CVE-2026-69418 [HIGH] CWE-122 CVE-2026-69418: Heap-based buffer overflow in Volume Manager Driver allows an authorized attacker to elevate privile Heap-based buffer overflow in Volume Manager Driver allows an authorized attacker to elevate privileges over a network.

CVE-2026-61352 [HIGH] CWE-362 CVE-2026-61352: Concurrent execution using shared resource with improper synchronization ('race condition') in Remot Concurrent execution using shared resource with improper synchronization ('race condition') in Remote Desktop Client allows an unauthorized attacker to execute code over a network.

CVE-2026-69429 [HIGH] CWE-122 CVE-2026-69429: Heap-based buffer overflow in Windows IKE Extension allows an authorized attacker to execute code ov Heap-based buffer overflow in Windows IKE Extension allows an authorized attacker to execute code over a network.

CVE-2026-24289 [HIGH] CWE-416 CVE-2026-24289: 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-2026-83923 [HIGH] CWE-23 CVE-2026-83923: Relative path traversal in OpenSSH for Windows allows an unauthorized attacker to execute code over Relative path traversal in OpenSSH for Windows allows an unauthorized attacker to execute code over a network.

CVE-2026-70275 [HIGH] CWE-822 CVE-2026-70275: Untrusted pointer dereference in Windows CD-ROM Driver allows an unauthorized attacker to execute co Untrusted pointer dereference in Windows CD-ROM Driver allows an unauthorized attacker to execute code over a network.

CVE-2026-85818 [CRITICAL] CWE-347 CVE-2026-85818: Improper verification of cryptographic signature in Windows Schannel allows an unauthorized attacker Improper verification of cryptographic signature in Windows Schannel allows an unauthorized attacker to perform spoofing over a network.

CVE-2026-102225 [HIGH] CWE-125 CVE-2026-102225: Out-of-bounds read in Windows Text Shaping allows an unauthorized attacker to execute code over a ne Out-of-bounds read in Windows Text Shaping allows an unauthorized attacker to execute code over a network.