CVE-2026-83887 in Windows
Summary
by MITRE • 10/14/2026
Out-of-bounds read in HID Parser Library allows an authorized attacker to disclose information locally.
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Analysis
by VulDB Data Team • 10/14/2026
The vulnerability identified within the Human Interface Device (HID) Parser Library represents a critical memory safety flaw classified as an out-of-bounds read, formally mapped to Common Weakness Enumeration identifier CWE-125. This specific type of error occurs when software attempts to access data at a memory location that is outside the boundaries of the intended buffer or array structure. In the context of HID parsing, this typically involves processing input reports from peripheral devices such as keyboards, mice, game controllers, or specialized industrial equipment. The parser is responsible for interpreting raw binary data sent by these hardware components into structured events understood by the operating system and applications. When the library fails to adequately validate the length or structure of incoming HID report descriptors before parsing them, it may read memory locations that contain sensitive information unrelated to the device input itself.
The operational impact of this vulnerability is primarily centered on local information disclosure. Because the flaw allows an attacker with authorized access to the system to trigger a read operation beyond allocated buffers, they can potentially extract arbitrary data from the process memory space. This disclosed information could include cryptographic keys, session tokens, passwords, or other sensitive user data residing in adjacent memory regions. The severity of this impact is heightened by the fact that HID devices are often trusted inputs; many systems automatically accept and parse input reports without rigorous sandboxing for every connected peripheral. Consequently, an attacker who has gained a foothold on the system, perhaps through phishing or exploiting another lower-severity vulnerability, can leverage this flaw to escalate their privileges or steal credentials from other running processes that share memory space with the HID parsing service.
From a threat modeling perspective, this vulnerability aligns with MITRE ATT&CK technique T1005, which covers Data from Local System. The attack vector is local, requiring physical access to plug in a maliciously crafted HID device or logical access if the system allows untrusted users to connect peripherals and execute code that interacts with them. While the initial requirement for authorization limits the scope of immediate exploitation by remote attackers, it remains a significant risk in environments where multiple users share systems or where privilege boundaries are not strictly enforced between user-level applications and system services handling HID input. The persistence of this vulnerability depends on whether the affected library is updated to include proper bounds checking during the parsing phase.
Mitigation strategies must focus on both immediate patching and long-term architectural improvements. Organizations should prioritize applying vendor-provided patches that address the specific out-of-bounds read condition in the HID Parser Library. For systems where updates are not immediately feasible, implementing strict input validation policies for connected peripherals can help reduce exposure. This includes disabling unused USB ports or configuring operating system settings to require user confirmation before accepting new HID devices. Furthermore, developers integrating this library should ensure that all buffer lengths and report sizes are validated against expected maximums before any parsing logic is executed. Adopting memory-safe programming practices and utilizing static analysis tools during the software development lifecycle can help prevent similar CWE-125 vulnerabilities in future iterations of the codebase. Regular security audits focusing on input handling routines for hardware interfaces are essential to maintaining a robust defense posture against local information disclosure attacks.