Microsoft Windows 11 26H1 vulnerabilities

CVE-2026-58547 [HIGH] CWE-122 CVE-2026-58547: Heap-based buffer overflow in Universal Plug and Play (upnp.dll) allows an authorized attacker to el Heap-based buffer overflow in Universal Plug and Play (upnp.dll) allows an authorized attacker to elevate privileges locally.

CVE-2026-50332 [HIGH] CWE-122 CVE-2026-50332: 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-2026-50327 [HIGH] CWE-122 CVE-2026-50327: Heap-based buffer overflow in Windows Media allows an authorized attacker to execute code locally. Heap-based buffer overflow in Windows Media allows an authorized attacker to execute code locally.

CVE-2026-58542 [HIGH] CWE-122 CVE-2026-58542: 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-2026-50680 [HIGH] CWE-122 CVE-2026-50680: Heap-based buffer overflow in Windows Hyper-V allows an authorized attacker to elevate privileges lo Heap-based buffer overflow in Windows Hyper-V allows an authorized attacker to elevate privileges locally.

CVE-2026-50477 [HIGH] CWE-122 CVE-2026-50477: 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-2026-56650 [HIGH] CWE-122 CVE-2026-56650: Heap-based buffer overflow in Windows Network File System allows an authorized attacker to elevate p Heap-based buffer overflow in Windows Network File System allows an authorized attacker to elevate privileges locally.

CVE-2026-50484 [HIGH] CWE-122 CVE-2026-50484: 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-2026-58538 [HIGH] CWE-122 CVE-2026-58538: Heap-based buffer overflow in Windows Bluetooth Service allows an authorized attacker to elevate pri Heap-based buffer overflow in Windows Bluetooth Service allows an authorized attacker to elevate privileges locally.

CVE-2026-50679 [HIGH] CWE-122 CVE-2026-50679: Heap-based buffer overflow in Microsoft Windows Search Component allows an authorized attacker to el Heap-based buffer overflow in Microsoft Windows Search Component allows an authorized attacker to elevate privileges locally.

CVE-2026-50363 [HIGH] CWE-122 CVE-2026-50363: Heap-based buffer overflow in Windows Push Notifications allows an authorized attacker to elevate pr Heap-based buffer overflow in Windows Push Notifications allows an authorized attacker to elevate privileges locally.

CVE-2026-50494 [HIGH] CWE-122 CVE-2026-50494: Heap-based buffer overflow in Windows NTFS allows an authorized attacker to execute code locally. Heap-based buffer overflow in Windows NTFS allows an authorized attacker to execute code locally.

CVE-2026-50417 [HIGH] CWE-20 CVE-2026-50417: Heap-based buffer overflow in Windows NTFS allows an authorized attacker to execute code locally. Heap-based buffer overflow in Windows NTFS allows an authorized attacker to execute code locally.

CVE-2026-50336 [HIGH] CWE-122 CVE-2026-50336: Heap-based buffer overflow in Windows Media allows an authorized attacker to elevate privileges loca Heap-based buffer overflow in Windows Media allows an authorized attacker to elevate privileges locally.

CVE-2026-56175 [HIGH] CWE-122 CVE-2026-56175: Heap-based buffer overflow in Windows NTFS allows an authorized attacker to elevate privileges local Heap-based buffer overflow in Windows NTFS allows an authorized attacker to elevate privileges locally.

CVE-2026-33841 [HIGH] CWE-122 CVE-2026-33841: 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-2026-40377 [HIGH] CWE-122 CVE-2026-40377: Heap-based buffer overflow in Windows Cryptographic Services allows an authorized attacker to elevat Heap-based buffer overflow in Windows Cryptographic Services allows an authorized attacker to elevate privileges locally.

CVE-2026-26180 [HIGH] CWE-122 CVE-2026-26180: 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-2026-50400 [HIGH] CWE-121 CVE-2026-50400: Stack-based buffer overflow in Windows App Installer allows an authorized attacker to elevate privil Stack-based buffer overflow in Windows App Installer allows an authorized attacker to elevate privileges locally.

CVE-2026-50423 [HIGH] CWE-284 CVE-2026-50423: Improper access control in Windows Kernel allows an authorized attacker to elevate privileges locall Improper access control in Windows Kernel allows an authorized attacker to elevate privileges locally.