Microsoft Windows 11 26H1 vulnerabilities

CVE-2026-54127 [HIGH] CWE-416 CVE-2026-54127: Use after free in Windows Hyper-V allows an unauthorized attacker to elevate privileges locally. Use after free in Windows Hyper-V allows an unauthorized attacker to elevate privileges locally.

CVE-2026-40400 [HIGH] CWE-23 CVE-2026-40400: Relative path traversal in Windows PowerShell allows an authorized attacker to execute code over a n Relative path traversal in Windows PowerShell allows an authorized attacker to execute code 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-2026-50655 [HIGH] CWE-122 CVE-2026-50655: Heap-based buffer overflow in Windows Media allows an unauthorized attacker to execute code locally. Heap-based buffer overflow in Windows Media allows an unauthorized attacker to execute code locally.

CVE-2026-58635 [HIGH] CWE-77 CVE-2026-58635: Improper neutralization of special elements used in a command ('command injection') in Windows Narra Improper neutralization of special elements used in a command ('command injection') in Windows Narrator Braille allows an authorized attacker to elevate privileges locally.

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-2026-58534 [HIGH] CWE-122 CVE-2026-58534: Heap-based buffer overflow in Microsoft Input Method Editor (IME) allows an authorized attacker to e Heap-based buffer overflow in Microsoft Input Method Editor (IME) allows an authorized attacker to elevate privileges locally.

CVE-2026-40407 [HIGH] CWE-122 CVE-2026-40407: 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-2026-40397 [HIGH] CWE-191 CVE-2026-40397: 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-2026-44808 [HIGH] CWE-122 CVE-2026-44808: Heap-based buffer overflow in Windows DWM Core Library allows an authorized attacker to elevate priv Heap-based buffer overflow in Windows DWM Core Library allows an authorized attacker to elevate privileges locally.

CVE-2026-44811 [HIGH] CWE-20 CVE-2026-44811: Heap-based buffer overflow in Windows DWM Core Library allows an authorized attacker to elevate priv Heap-based buffer overflow in Windows DWM Core Library allows an authorized attacker to elevate privileges locally.

CVE-2026-26160 [HIGH] CWE-306 CVE-2026-26160: Missing authentication for critical function in Windows Remote Desktop Licensing Service allows an a Missing authentication for critical function in Windows Remote Desktop Licensing Service allows an authorized attacker to elevate privileges locally.

CVE-2026-44810 [HIGH] CWE-287 CVE-2026-44810: Improper authentication in Windows Cryptographic Services allows an unauthorized attacker to elevate Improper authentication in Windows Cryptographic Services allows an unauthorized attacker to elevate privileges locally.

CVE-2026-49793 [HIGH] CWE-122 CVE-2026-49793: 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-2026-50499 [HIGH] CWE-122 CVE-2026-50499: Heap-based buffer overflow in Windows Print Spooler Components allows an authorized attacker to elev Heap-based buffer overflow in Windows Print Spooler Components allows an authorized attacker to elevate privileges locally.

CVE-2026-58601 [HIGH] CWE-122 CVE-2026-58601: 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-2026-50451 [HIGH] CWE-306 CVE-2026-50451: Missing authentication for critical function in Windows Routing and Remote Access Service (RRAS) all Missing authentication for critical function in Windows Routing and Remote Access Service (RRAS) allows an authorized attacker to elevate privileges locally.

CVE-2026-58535 [HIGH] CWE-908 CVE-2026-58535: Use of uninitialized resource in Windows RDP allows an unauthorized attacker to disclose information Use of uninitialized resource in Windows RDP allows an unauthorized attacker to disclose information over a network.

CVE-2026-58533 [HIGH] CWE-908 CVE-2026-58533: Use of uninitialized resource in Windows RDP allows an unauthorized attacker to disclose information Use of uninitialized resource in Windows RDP allows an unauthorized attacker to disclose information over a network.

CVE-2026-50497 [HIGH] CWE-193 CVE-2026-50497: Off-by-one error in Windows Remote Desktop Protocol allows an unauthorized attacker to disclose info Off-by-one error in Windows Remote Desktop Protocol allows an unauthorized attacker to disclose information over a network.