EUVD-2026-44047
GHSA-93qq-4vh3-3vm5
Severity by source
AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N
Local low-privilege user triggers uninitialized read in upnp.dll; high confidentiality impact from memory disclosure, no integrity or availability impact.
Primary rating from Vendor (microsoft).
CVSS VectorVendor: microsoft
Lifecycle Timeline
2DescriptionCVE.org
Use of uninitialized resource in Universal Plug and Play (upnp.dll) allows an authorized attacker to disclose information locally.
AnalysisAI
Local information disclosure in Windows Universal Plug and Play (upnp.dll) exposes sensitive memory contents to authorized low-privilege users across a wide range of Windows 10, Windows 11, and Windows Server releases. The flaw stems from use of an uninitialized resource (CWE-908), meaning the UPnP service reads from memory that has not been properly initialized before use, potentially leaking stale heap or stack contents. No active exploitation has been confirmed and no public exploit code has been identified at time of analysis; a vendor patch is available via the Microsoft Security Response Center.
Technical ContextAI
Universal Plug and Play (UPnP) is a set of networking protocols enabling devices to discover and communicate with each other automatically. Windows implements UPnP functionality in upnp.dll, a system DLL loaded in the context of the UPnP service. CWE-908 (Use of Uninitialized Resource) indicates that a variable or memory buffer is accessed before a value is written to it, meaning the code may read whatever bytes happened to occupy that memory region previously - potentially including credentials, keys, or sensitive application data from prior allocations. Affected CPEs span the Microsoft Windows product family from Windows 10 version 1607 through Windows 11 version 26H1 and Windows Server 2012 through Windows Server 2025, indicating a long-standing defect in the UPnP implementation rather than a regression in a specific build.
RemediationAI
Apply the vendor-released patch via Windows Update or the Microsoft Security Response Center advisory at https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-50455. The exact patched build version was not independently confirmed from available references, so administrators should consult the MSRC advisory for the specific KB article applicable to each Windows release. As a compensating control where immediate patching is not feasible, disabling the SSDP Discovery service and UPnP Device Host service (Services.msc: 'SSDP Discovery' and 'UPnP Device Host') will prevent upnp.dll from being exercised; note that this disables UPnP device discovery functionality, which may affect media streaming, printer auto-discovery, and similar features. Restricting local interactive login to only trusted administrators on affected servers reduces the exploitable user population.
More in Windows 10 Version 1607
View allRemote code execution in Windows IKE Extension (Internet Key Exchange) via double free memory corruption allows unauthen
Local privilege escalation in Microsoft Active Directory Federation Services (AD FS) lets an already-authenticated low-p
Windows Shell protection mechanism failure (CVE-2026-32202) allows remote attackers to perform spoofing attacks over a n
Local privilege escalation in the Microsoft Windows Kernel allows an unauthorized attacker to gain elevated (SYSTEM-leve
Local code execution in the Windows DHCP Client service stems from a use-after-free (CWE-416) memory-corruption flaw aff
Remote code execution in the Microsoft Windows DHCP Server role allows an unauthenticated network attacker to run arbitr
Local code execution in the Windows Media component of supported Windows 10, Windows 11, and Windows Server (2016 throug
Local privilege escalation via heap-based buffer overflow in the Windows Message Queuing (MSMQ) Queue Manager component
Local privilege escalation in Microsoft Windows Win32K lets an authenticated low-privileged user corrupt kernel heap mem
Local privilege escalation in the Windows NTFS file system driver lets an authenticated low-privileged user win a race c
Elevation of privilege in the Windows Hyper-V virtual network switch (VMSwitch) lets an authenticated attacker operating
Remote code execution in Microsoft Windows Remote Desktop (RDP) allows an unauthorized network attacker to run arbitrary
Same weakness CWE-908 – Use of Uninitialized Resource
View allSame technique Information Disclosure
View allShare
External POC / Exploit Code
Leaving vuln.today