Microsoft Windows 11 Version 26H1 vulnerabilities

CVE-2026-69366 [HIGH] CWE-416 CVE-2026-69366: Use after free in Windows Kernel allows an authorized attacker to elevate privileges over a network. Use after free in Windows Kernel allows an authorized attacker to elevate privileges over a network.

CVE-2026-69272 [HIGH] CWE-122 CVE-2026-69272: Heap-based buffer overflow in Microsoft Standard XPS allows an authorized attacker to elevate privil Heap-based buffer overflow in Microsoft Standard XPS allows an authorized attacker to elevate privileges over a network.

CVE-2026-69313 [HIGH] CWE-122 CVE-2026-69313: Heap-based buffer overflow in Microsoft Standard XPS allows an authorized attacker to elevate privil Heap-based buffer overflow in Microsoft Standard XPS allows an authorized attacker to elevate privileges over a network.

CVE-2026-83708 [HIGH] CWE-121 CVE-2026-83708: Stack-based buffer overflow in Windows Installer allows an authorized attacker to elevate privileges Stack-based buffer overflow in Windows Installer allows an authorized attacker to elevate privileges locally.

CVE-2026-97817 [MEDIUM] CWE-122 CVE-2026-97817: Heap-based buffer overflow in DNS Server allows an authorized attacker to disclose information over Heap-based buffer overflow in DNS Server allows an authorized attacker to disclose information over a network.

CVE-2026-72961 [HIGH] CWE-122 CVE-2026-72961: Out-of-bounds read in Windows Hyper-V allows an authorized attacker to elevate privileges locally. Out-of-bounds read in Windows Hyper-V allows an authorized attacker to elevate privileges locally.

CVE-2026-69694 [HIGH] CWE-502 CVE-2026-69694: Deserialization of untrusted data in Windows IP Address Management (IPAM) Service allows an authoriz Deserialization of untrusted data in Windows IP Address Management (IPAM) Service allows an authorized attacker to elevate privileges locally.

CVE-2026-21241 [HIGH] CWE-416 CVE-2026-21241: 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-2026-25190 [HIGH] CWE-426 CVE-2026-25190: Untrusted search path in Windows GDI allows an unauthorized attacker to execute code locally. Untrusted search path in Windows GDI allows an unauthorized attacker to execute code locally.

CVE-2026-48578 [HIGH] CWE-284 CVE-2026-48578: Improper access control in Windows Secure Boot allows an authorized attacker to elevate privileges l Improper access control in Windows Secure Boot allows an authorized attacker to elevate privileges locally.

CVE-2026-50388 [HIGH] CWE-125 CVE-2026-50388: Out-of-bounds read in Windows NTFS allows an unauthorized attacker to execute code locally. Out-of-bounds read in Windows NTFS allows an unauthorized attacker to execute code locally.

CVE-2026-50308 [HIGH] CWE-122 CVE-2026-50308: Integer underflow (wrap or wraparound) in Windows NTFS allows an unauthorized attacker to execute co Integer underflow (wrap or wraparound) in Windows NTFS allows an unauthorized attacker to execute code locally.

CVE-2026-54124 [HIGH] CWE-122 CVE-2026-54124: Integer overflow or wraparound in Windows Terminal allows an unauthorized attacker to execute code l Integer overflow or wraparound in Windows Terminal allows an unauthorized attacker to execute code locally.

CVE-2026-40378 [HIGH] CWE-789 CVE-2026-40378: Memory allocation with excessive size value in Windows Local Security Authority Subsystem Service (L Memory allocation with excessive size value in Windows Local Security Authority Subsystem Service (LSASS) allows an unauthorized attacker to deny service over a network.

CVE-2026-50424 [HIGH] CWE-822 CVE-2026-50424: Untrusted pointer dereference in Windows Domain Controller allows an unauthorized attacker to deny s Untrusted pointer dereference in Windows Domain Controller allows an unauthorized attacker to deny service over a network.

CVE-2026-26161 [HIGH] CWE-20 CVE-2026-26161: Untrusted pointer dereference in Windows Sensor Data Service allows an authorized attacker to elevat Untrusted pointer dereference in Windows Sensor Data Service allows an authorized attacker to elevate privileges locally.

CVE-2026-35416 [HIGH] CWE-416 CVE-2026-35416: Access of resource using incompatible type ('type confusion') in Windows Ancillary Function Driver f Access of resource using incompatible type ('type confusion') in Windows Ancillary Function Driver for WinSock allows an authorized attacker to elevate privileges locally.

CVE-2026-27908 [HIGH] CWE-416 CVE-2026-27908: Use after free in Windows TDI Translation Driver (tdx.sys) allows an authorized attacker to elevate Use after free in Windows TDI Translation Driver (tdx.sys) allows an authorized attacker to elevate privileges locally.

CVE-2026-69890 [HIGH] CWE-416 CVE-2026-69890: Use after free in Windows Virtual Trusted Platform Module allows an authorized attacker to elevate p Use after free in Windows Virtual Trusted Platform Module allows an authorized attacker to elevate privileges locally.

CVE-2026-21235 [HIGH] CWE-416 CVE-2026-21235: Use after free in Microsoft Graphics Component allows an authorized attacker to elevate privileges l Use after free in Microsoft Graphics Component allows an authorized attacker to elevate privileges locally.