Microsoft Windows 11 26H1 vulnerabilities

CVE-2026-27909 [HIGH] CWE-416 CVE-2026-27909: 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 locally.

CVE-2026-81354 [HIGH] CWE-122 CVE-2026-81354: Heap-based buffer overflow in Windows Hello allows an authorized attacker to elevate privileges loca Heap-based buffer overflow in Windows Hello allows an authorized attacker to elevate privileges locally.

CVE-2026-69332 [HIGH] CWE-125 CVE-2026-69332: Out-of-bounds read in Windows NTFS allows an authorized attacker to elevate privileges over a networ Out-of-bounds read in Windows NTFS allows an authorized attacker to elevate privileges over a network.

CVE-2026-69505 [HIGH] CWE-125 CVE-2026-69505: Out-of-bounds read in Windows NTFS allows an authorized attacker to elevate privileges over a networ Out-of-bounds read in Windows NTFS allows an authorized attacker to elevate privileges over a network.

CVE-2026-69458 [HIGH] CWE-125 CVE-2026-69458: Out-of-bounds read in Windows BitLocker allows an authorized attacker to elevate privileges over a n Out-of-bounds read in Windows BitLocker allows an authorized attacker to elevate privileges over a network.

CVE-2026-50365 [HIGH] CWE-287 CVE-2026-50365: Improper authentication in Windows RPC API allows an unauthorized attacker to elevate privileges ove Improper authentication in Windows RPC API allows an unauthorized attacker to elevate privileges over an adjacent network.

CVE-2026-57087 [HIGH] CWE-122 CVE-2026-57087: Heap-based buffer overflow in Microsoft Windows Media Foundation allows an unauthorized attacker to Heap-based buffer overflow in Microsoft Windows Media Foundation allows an unauthorized attacker to execute code over a network.

CVE-2026-83795 [HIGH] CWE-122 CVE-2026-83795: Heap-based buffer overflow in Windows IKE Extension allows an unauthorized attacker to deny service Heap-based buffer overflow in Windows IKE Extension allows an unauthorized attacker to deny service over a network.

CVE-2026-69718 [HIGH] CWE-77 CVE-2026-69718: Improper neutralization of special elements used in a command ('command injection') in Windows Updat Improper neutralization of special elements used in a command ('command injection') in Windows Update allows an authorized attacker to elevate privileges locally.

CVE-2026-69588 [HIGH] CWE-401 CVE-2026-69588: Missing release of memory after effective lifetime in Windows TCP/IP allows an unauthorized attacker Missing release of memory after effective lifetime in Windows TCP/IP allows an unauthorized attacker to deny service over a network.

CVE-2026-50695 [HIGH] CWE-121 CVE-2026-50695: Stack-based buffer overflow in Active Directory Federation Services allows an unauthorized attacker Stack-based buffer overflow in Active Directory Federation Services allows an unauthorized attacker to deny service over a network.

CVE-2026-50411 [HIGH] CWE-121 CVE-2026-50411: Stack-based buffer overflow in Active Directory Federation Services (AD FS) allows an unauthorized a Stack-based buffer overflow in Active Directory Federation Services (AD FS) allows an unauthorized attacker to deny service over a network.

CVE-2026-54983 [HIGH] CWE-121 CVE-2026-54983: Stack-based buffer overflow in Active Directory Federation Services (AD FS) allows an unauthorized a Stack-based buffer overflow in Active Directory Federation Services (AD FS) allows an unauthorized attacker to deny service over a network.

CVE-2026-50696 [HIGH] CWE-122 CVE-2026-50696: Heap-based buffer overflow in Windows Internet Key Exchange (IKE) Protocol allows an unauthorized at Heap-based buffer overflow in Windows Internet Key Exchange (IKE) Protocol allows an unauthorized attacker to deny service over a network.

CVE-2026-87716 [HIGH] CWE-122 CVE-2026-87716: Heap-based buffer overflow in Windows Storage Spaces Controller allows an unauthorized attacker to d Heap-based buffer overflow in Windows Storage Spaces Controller allows an unauthorized attacker to deny service over a network.

CVE-2026-58530 [HIGH] CWE-122 CVE-2026-58530: Heap-based buffer overflow in Windows Resilient File System (ReFS) allows an unauthorized attacker t Heap-based buffer overflow in Windows Resilient File System (ReFS) allows an unauthorized attacker to execute code locally.

CVE-2026-102227 [HIGH] CWE-122 CVE-2026-102227: Heap-based buffer overflow in Windows Resilient File System (ReFS) allows an authorized attacker to Heap-based buffer overflow in Windows Resilient File System (ReFS) allows an authorized attacker to execute code locally.

CVE-2026-69758 [HIGH] CWE-122 CVE-2026-69758: Heap-based buffer overflow in Windows Universal Disk Format File System Driver (UDFS) allows an auth Heap-based buffer overflow in Windows Universal Disk Format File System Driver (UDFS) allows an authorized attacker to elevate privileges locally.

CVE-2026-69541 [HIGH] CWE-122 CVE-2026-69541: 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-2026-69467 [HIGH] CWE-121 CVE-2026-69467: Stack-based buffer overflow in Microsoft Graphics Component allows an authorized attacker to elevate Stack-based buffer overflow in Microsoft Graphics Component allows an authorized attacker to elevate privileges locally.