Microsoft Windows 11 26H1 vulnerabilities

CVE-2026-109453 [HIGH] CWE-122 CVE-2026-109453: Heap-based buffer overflow in Virtual Hard Disk (VHD) Miniport Driver allows an authorized attacker Heap-based buffer overflow in Virtual Hard Disk (VHD) Miniport Driver allows an authorized attacker to elevate privileges locally.

CVE-2026-97810 [HIGH] CWE-122 CVE-2026-97810: Heap-based buffer overflow in Windows Container Isolation FS Filter Driver (unionfs.sys) allows an a Heap-based buffer overflow in Windows Container Isolation FS Filter Driver (unionfs.sys) allows an authorized attacker to elevate privileges locally.

CVE-2026-103555 [HIGH] CWE-122 CVE-2026-103555: Heap-based buffer overflow in Virtual Hard Disk (VHD) Miniport Driver allows an authorized attacker Heap-based buffer overflow in Virtual Hard Disk (VHD) Miniport Driver allows an authorized attacker to elevate privileges locally.

CVE-2026-102209 [HIGH] CWE-122 CVE-2026-102209: Heap-based buffer overflow in Microsoft Graphics Component allows an authorized attacker to elevate Heap-based buffer overflow in Microsoft Graphics Component allows an authorized attacker to elevate privileges locally.

CVE-2026-69492 [HIGH] CWE-122 CVE-2026-69492: Heap-based buffer overflow in Windows Partition Management Driver allows an authorized attacker to e Heap-based buffer overflow in Windows Partition Management Driver allows an authorized attacker to elevate privileges locally.

CVE-2026-69563 [HIGH] CWE-122 CVE-2026-69563: Heap-based buffer overflow in Windows Program Compatibility Assistant Service allows an authorized a Heap-based buffer overflow in Windows Program Compatibility Assistant Service allows an authorized attacker to elevate privileges locally.

CVE-2026-85365 [HIGH] CWE-122 CVE-2026-85365: Heap-based buffer overflow in Servicing Stack Updates allows an authorized attacker to elevate privi Heap-based buffer overflow in Servicing Stack Updates allows an authorized attacker to elevate privileges locally.

CVE-2026-59116 [MEDIUM] CWE-327 CVE-2026-59116: Use of a broken or risky cryptographic algorithm in Windows Remote Desktop allows an unauthorized at Use of a broken or risky cryptographic algorithm in Windows Remote Desktop allows an unauthorized attacker to bypass a security feature over a network.

CVE-2026-83906 [MEDIUM] CWE-303 CVE-2026-83906: Incorrect implementation of authentication algorithm in Windows Shell allows an unauthorized attacke Incorrect implementation of authentication algorithm in Windows Shell allows an unauthorized attacker to perform spoofing over a network.

CVE-2026-57982 [MEDIUM] CWE-908 CVE-2026-57982: Use of uninitialized resource in Windows RDP allows an authorized attacker to disclose information o Use of uninitialized resource in Windows RDP allows an authorized attacker to disclose information over a network.

CVE-2026-97842 [MEDIUM] CWE-125 CVE-2026-97842: Out-of-bounds read in DNS Server allows an authorized attacker to disclose information over a networ Out-of-bounds read in DNS Server allows an authorized attacker to disclose information over a network.

CVE-2026-87714 [MEDIUM] CWE-862 CVE-2026-87714: Missing authorization in WebDAV allows an authorized attacker to bypass a security feature over a ne Missing authorization in WebDAV allows an authorized attacker to bypass a security feature over a network.

CVE-2026-50302 [MEDIUM] CWE-295 CVE-2026-50302: Improper certificate validation in Windows Cryptographic Services allows an unauthorized attacker to Improper certificate validation in Windows Cryptographic Services allows an unauthorized attacker to bypass a security feature over a network.

CVE-2026-40414 [HIGH] CWE-476 CVE-2026-40414: 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-2026-26151 [HIGH] CWE-357 CVE-2026-26151: Insufficient ui warning of dangerous operations in Windows Remote Desktop allows an unauthorized att Insufficient ui warning of dangerous operations in Windows Remote Desktop allows an unauthorized attacker to perform spoofing over a network.

CVE-2026-69305 [HIGH] CWE-416 CVE-2026-69305: Use after free in Microsoft Windows Search Component allows an authorized attacker to elevate privil Use after free in Microsoft Windows Search Component allows an authorized attacker to elevate privileges over a network.

CVE-2026-70198 [HIGH] CWE-416 CVE-2026-70198: Use after free in Windows Push Notifications allows an authorized attacker to elevate privileges loc Use after free in Windows Push Notifications allows an authorized attacker to elevate privileges locally.

CVE-2026-83566 [HIGH] CWE-416 CVE-2026-83566: Use after free in Windows Win32K - ICOMP allows an authorized attacker to elevate privileges locally Use after free in Windows Win32K - ICOMP allows an authorized attacker to elevate privileges locally.

CVE-2026-83675 [HIGH] CWE-416 CVE-2026-83675: 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-2026-70241 [HIGH] CWE-416 CVE-2026-70241: Use after free in Windows Kerberos allows an authorized attacker to elevate privileges locally. Use after free in Windows Kerberos allows an authorized attacker to elevate privileges locally.