EUVD-2026-43886
GHSA-24hm-687f-7ggw
Severity by source
AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:N/A:N
Local-only HID subsystem flaw requiring low-privilege account and non-trivial trigger conditions; confidentiality-only impact confirmed by description.
Primary rating from Vendor (microsoft).
CVSS VectorVendor: microsoft
Lifecycle Timeline
2DescriptionCVE.org
Integer overflow or wraparound in Windows Devices Human Interface allows an authorized attacker to disclose information locally.
AnalysisAI
Integer overflow in the Windows Devices Human Interface (HID) subsystem enables a local, low-privileged attacker to disclose sensitive information on affected systems. The vulnerability spans Windows 10 (versions 1809 through 22H2), Windows 11 (versions 24H2 through 26H1), and Windows Server 2019 through 2025, representing a broad attack surface across Microsoft's supported OS portfolio. No public exploit code exists and CISA SSVC rates current exploitation as none, with an EPSS score of 0.30% (22nd percentile) confirming very low near-term exploitation probability.
Technical ContextAI
The flaw is rooted in CWE-190 (Integer Overflow or Wraparound) within the Windows Human Interface Device subsystem - the kernel-mode driver stack responsible for processing input from keyboards, mice, gamepads, and other HID-class devices. An integer overflow in this context typically arises when a size or length calculation wraps around due to exceeding the maximum value for its data type, causing subsequent memory operations to read from unintended memory regions. Because the HID subsystem operates in a privileged context, an overflow can result in controlled or uncontrolled reads of kernel or adjacent process memory, yielding sensitive data to a caller-controlled buffer. Affected CPEs span cpe:2.3:a:microsoft:windows_10_version_1809 through cpe:2.3:a:microsoft:windows_server_2025, confirming this is a component shared across a wide range of Windows builds.
RemediationAI
Apply the vendor-released patches via Windows Update or WSRC. Exact fixed builds per the EUVD data are: Windows 10 1809 and Server 2019 - 10.0.17763.9020; Windows 10 21H2 - 10.0.19044.7548; Windows 10 22H2 - 10.0.19045.7548; Windows Server 2022 - 10.0.20348.5386; Windows 11 24H2 and Server 2025 - 10.0.26100.8875 (Windows 11) / 10.0.26100.33158 (Server 2025); Windows 11 25H2 - 10.0.26200.8875; Windows 11 26H1 - 10.0.28000.2269. The authoritative Microsoft advisory is at https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-50310. Because exploitation requires local access with at least a standard user account, environments that strictly enforce least-privilege access and limit interactive logon to managed accounts meaningfully reduce exposure until patching is complete. There are no documented functional workarounds that eliminate the vulnerability without applying the patch.
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Same weakness CWE-190 – Integer Overflow or Wraparound
View allSame technique Information Disclosure
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External POC / Exploit Code
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