CVE-2026-50310 Overview
CVE-2026-50310 is an integer overflow vulnerability [CWE-190] in the Windows Devices Human Interface component. An authorized local attacker can trigger the flaw to disclose sensitive information from the target system. The issue affects multiple supported versions of Windows 10, Windows 11, and Windows Server. Microsoft addressed the vulnerability through its security update process.
Exploitation requires local access and low privileges, but the attack complexity is high. The vulnerability impacts confidentiality only, with no direct effect on integrity or availability. The EPSS score is 0.298% with a percentile of 21.842, indicating a low probability of exploitation in the near term.
Critical Impact
An authenticated local attacker can leverage the integer overflow in the Human Interface Devices stack to read memory contents that should remain protected, potentially exposing kernel or process data.
Affected Products
- Microsoft Windows 10 (versions 1809, 21H2, 22H2) across x86, x64, and ARM64 architectures
- Microsoft Windows 11 (versions 24H2, 25H2, 26H1) across x64 and ARM64 architectures
- Microsoft Windows Server 2019, 2022, and 2025
Discovery Timeline
- 2026-07-14 - CVE-2026-50310 published to NVD
- 2026-07-16 - Last updated in NVD database
Technical Details for CVE-2026-50310
Vulnerability Analysis
The vulnerability resides in the Windows Devices Human Interface (HID) subsystem, which processes input from devices such as keyboards, mice, game controllers, and other peripherals. An integer overflow or wraparound condition [CWE-190] occurs during size or index calculations in the HID processing path. When the arithmetic wraps, subsequent memory operations reference regions outside the intended buffer boundaries.
This condition allows an authorized local attacker to read data from adjacent memory. The attack is constrained by high complexity, meaning the attacker must satisfy specific runtime conditions or win a timing window to trigger the overflow reliably.
Root Cause
The root cause is unchecked arithmetic on values derived from device descriptors or report data. When a computed length or offset exceeds the maximum representable value of its data type, the result wraps to a small or negative number. The HID handler then uses this attacker-influenced value in a read operation, exposing memory contents that should not be accessible to the caller.
Attack Vector
The attack vector is local (AV:L). An attacker must already possess valid credentials and the ability to execute code on the target host. From that foothold, the attacker interacts with the HID interface, supplying crafted input that triggers the overflow condition. Successful exploitation returns sensitive information such as kernel pointers or process memory, which can facilitate further attacks like privilege escalation chains.
No public proof-of-concept exploit is available, and the vulnerability is not listed in the CISA Known Exploited Vulnerabilities catalog.
Detection Methods for CVE-2026-50310
Indicators of Compromise
- Unexpected user-mode processes repeatedly opening handles to HID device objects under \\.\HID# paths
- Anomalous crashes or bug checks referencing hidclass.sys, hidparse.sys, or related HID drivers
- Unsigned or unusual binaries issuing IOCTL_HID_* requests outside normal input workflows
Detection Strategies
- Monitor process behavior for non-input applications interacting with HID device stacks or issuing malformed HID reports
- Correlate local logon events with subsequent device enumeration and IOCTL activity from the same session
- Baseline legitimate HID driver interactions and alert on deviations, particularly from processes running with standard user privileges
Monitoring Recommendations
- Enable Windows Event Log auditing for device install and driver load events (Event IDs 400, 410, 420 in Microsoft-Windows-DeviceSetupManager)
- Collect kernel crash dumps and analyze faulting modules for HID components to identify exploitation attempts
- Ingest endpoint telemetry into a centralized data lake for cross-host correlation of HID-related anomalies
How to Mitigate CVE-2026-50310
Immediate Actions Required
- Apply the Microsoft security update referenced in the Microsoft Security Update Guide for CVE-2026-50310 to all affected systems
- Prioritize patching on multi-user hosts, terminal servers, and shared workstations where local access is common
- Audit local account inventories and remove unnecessary interactive logon rights to reduce the attacker population
Patch Information
Microsoft has released updates addressing CVE-2026-50310 through its regular security update channel. Refer to the Microsoft Security Update Guide for the specific KB articles and package versions corresponding to each Windows build. Install the update through Windows Update, WSUS, or Microsoft Update Catalog based on your patch management workflow.
Workarounds
- No official workaround has been published by Microsoft; applying the security update is the recommended remediation
- Restrict interactive and remote desktop access to trusted administrators until systems are patched
- Enforce application allowlisting to prevent untrusted binaries from interacting with the HID interface
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
