EUVD-2026-43865
GHSA-49p5-xww8-w8pf
Severity by source
AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N
Local access with low-privilege authentication required; confidentiality-only partial impact; no integrity or availability effect aligns with kernel info disclosure.
Primary rating from Vendor (microsoft).
CVSS VectorVendor: microsoft
Lifecycle Timeline
2DescriptionCVE.org
Exposure of sensitive information to an unauthorized actor in Windows Kernel allows an authorized attacker to disclose information locally.
AnalysisAI
Windows Kernel information disclosure across a broad range of Microsoft Windows 10, Windows 11, and Windows Server editions allows a locally authenticated low-privileged attacker to read sensitive kernel memory contents they are not authorized to access. The flaw is classified under CWE-200 (Exposure of Sensitive Information to an Unauthorized Actor) and is confined to local exploitation with no integrity or availability impact. No public exploit code or active exploitation has been identified at time of analysis, and Microsoft has released patches addressing the issue across all affected version branches per EUVD-2026-43865.
Technical ContextAI
The vulnerability resides in the Windows Kernel (NT Executive), the core privileged component responsible for memory management, process isolation, and system call handling. CWE-200 indicates that the kernel inadvertently exposes internal state or memory contents to a calling process operating at a lower privilege level - a pattern common in kernel IOCTL handlers, system call return paths, or uninitialized kernel stack/pool buffers. CPE data confirms the affected surface spans 18 distinct Windows build lines: Windows 10 versions 1607, 1809, 21H2, and 22H2; Windows 11 versions 24H2, 25H2, and 26H1; and Windows Server 2012, 2012 R2, 2016, 2019, 2022, and 2025 (including Server Core installations). The breadth of affected versions suggests the vulnerable code path exists in a shared kernel component rather than a version-specific feature.
RemediationAI
Apply the vendor-released security update from the Microsoft Security Response Center advisory at https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-50419 targeting the specific build floor for each affected Windows version as listed in the EUVD affected versions data (e.g., update Windows Server 2025 to build 10.0.26100.33158 or later, Windows 10 22H2 to 10.0.19045.7548 or later). Patching is the definitive remediation; there are no documented workarounds for kernel information disclosure of this type. For environments where patching is immediately infeasible - particularly Windows Server 2012 and 2012 R2, which are past mainstream support - restrict local interactive and remote desktop login to only explicitly trusted accounts, as exploitation requires a locally authenticated user. Reducing the local user population on multi-tenant systems (shared servers, terminal services, VDI) shrinks the practical attack surface until the patch can be applied. Note that Windows Server 2012 R2 requires active Extended Security Updates (ESU) subscription to receive this fix.
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Same weakness CWE-200 – Information Exposure
View allSame technique Information Disclosure
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External POC / Exploit Code
Leaving vuln.today