Microsoft Windows 11 26H1 vulnerabilities

CVE-2026-70568 [HIGH] CWE-122 CVE-2026-70568: Heap-based buffer overflow in Windows Defender Firewall Service allows an authorized attacker to ele Heap-based buffer overflow in Windows Defender Firewall Service allows an authorized attacker to elevate privileges locally.

CVE-2026-69621 [HIGH] CWE-122 CVE-2026-69621: Heap-based buffer overflow in Windows Fax Service allows an authorized attacker to elevate privilege Heap-based buffer overflow in Windows Fax Service allows an authorized attacker to elevate privileges locally.

CVE-2026-69394 [HIGH] CWE-122 CVE-2026-69394: Heap-based buffer overflow in Windows Audio Service allows an authorized attacker to elevate privile Heap-based buffer overflow in Windows Audio Service allows an authorized attacker to elevate privileges locally.

CVE-2026-62753 [HIGH] CWE-122 CVE-2026-62753: Heap-based buffer overflow in Windows HTTP.sys allows an authorized attacker to elevate privileges l Heap-based buffer overflow in Windows HTTP.sys allows an authorized attacker to elevate privileges locally.

CVE-2026-85828 [HIGH] CWE-122 CVE-2026-85828: Heap-based buffer overflow in WebDAV allows an authorized attacker to elevate privileges locally. Heap-based buffer overflow in WebDAV allows an authorized attacker to elevate privileges locally.

CVE-2026-45653 [HIGH] CWE-122 CVE-2026-45653: Heap-based buffer overflow in Windows Kernel allows an authorized attacker to elevate privileges loc Heap-based buffer overflow in Windows Kernel allows an authorized attacker to elevate privileges locally.

CVE-2026-32195 [HIGH] CWE-121 CVE-2026-32195: Stack-based buffer overflow in Windows Kernel allows an authorized attacker to elevate privileges lo Stack-based buffer overflow in Windows Kernel allows an authorized attacker to elevate privileges locally.

CVE-2026-83871 [HIGH] CWE-122 CVE-2026-83871: Heap-based buffer overflow in OpenSSH for Windows allows an authorized attacker to elevate privilege Heap-based buffer overflow in OpenSSH for Windows allows an authorized attacker to elevate privileges locally.

CVE-2026-84014 [HIGH] CWE-122 CVE-2026-84014: Heap-based buffer overflow in Windows Device Association Service allows an authorized attacker to el Heap-based buffer overflow in Windows Device Association Service allows an authorized attacker to elevate privileges locally.

CVE-2026-83683 [MEDIUM] CWE-36 CVE-2026-83683: Absolute path traversal in Windows Encrypting File System (EFS) allows an authorized attacker to dis Absolute path traversal in Windows Encrypting File System (EFS) allows an authorized attacker to disclose information over a network.

CVE-2026-85840 [MEDIUM] CWE-552 CVE-2026-85840: Files or directories accessible to external parties in Windows Event Viewer allows an authorized att Files or directories accessible to external parties in Windows Event Viewer allows an authorized attacker to disclose information over a network.

CVE-2026-97828 [MEDIUM] CWE-126 CVE-2026-97828: Buffer over-read in DNS Server allows an authorized attacker to disclose information over a network. Buffer over-read in DNS Server allows an authorized attacker to disclose information over a network.

CVE-2026-61920 [MEDIUM] CWE-362 CVE-2026-61920: Concurrent execution using shared resource with improper synchronization ('race condition') in Windo Concurrent execution using shared resource with improper synchronization ('race condition') in Windows DNS allows an authorized attacker to execute code over a network.

CVE-2026-50682 [HIGH] CWE-125 CVE-2026-50682: Out-of-bounds read in Windows Active Directory allows an authorized attacker to deny service over a Out-of-bounds read in Windows Active Directory allows an authorized attacker to deny service over a network.

CVE-2026-83715 [HIGH] CWE-306 CVE-2026-83715: Missing authentication for critical function in Windows Error Reporting allows an authorized attacke Missing authentication for critical function in Windows Error Reporting allows an authorized attacker to perform tampering locally.

CVE-2026-85870 [HIGH] CWE-122 CVE-2026-85870: Heap-based buffer overflow in Windows Common Log File System Driver allows an authorized attacker to Heap-based buffer overflow in Windows Common Log File System Driver allows an authorized attacker to elevate privileges locally.

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.