CVE-2026-83884 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, which corresponds directly to CWE-125 under the Common Weakness Enumeration standard. 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 interfaces. The parser is responsible for interpreting raw binary data sent by these hardware components into structured information that operating systems and applications can utilize. When a malformed or maliciously crafted report exceeds expected dimensions or contains invalid descriptors, the parsing logic may calculate an incorrect memory offset, leading to a read operation beyond the allocated buffer space.
From a technical perspective, this flaw allows for the local disclosure of sensitive system information without requiring elevated privileges on many systems, although the prompt specifies that an authorized attacker is required to exploit it. This implies that while remote exploitation over network protocols like USB or Bluetooth might not be feasible due to physical access requirements or authentication gates, any user account with permission to interact with HID devices can trigger the condition. The out-of-bounds read does not typically allow for arbitrary code execution directly but serves as a powerful information leak vector. By carefully crafting input reports that cause the parser to read adjacent memory regions, an attacker can extract contents of nearby variables, stack frames, or heap structures. This data may include cryptographic keys, session tokens, passwords stored in memory buffers, or internal state information about running applications and kernel modules.
The operational impact of this vulnerability is significant for environments where sensitive data resides in close proximity to HID parsing buffers within the same process space. Attackers can leverage this flaw to perform reconnaissance against local security controls, bypassing certain isolation mechanisms by reading protected memory segments that should remain inaccessible to standard user processes. This aligns with ATT&CK technique T1005, which covers Data from Local System, specifically under sub-techniques related to application data or memory dumps obtained through exploitation of software vulnerabilities rather than direct file access tools. The ability to leak information locally can facilitate further attacks, such as privilege escalation by revealing kernel addresses for bypassing Address Space Layout Randomization (ASLR), or session hijacking if authentication tokens are exposed in process memory during HID interaction events.
Mitigation strategies must focus on both immediate remediation and long-term architectural improvements. The primary defense is the deployment of vendor-provided patches that update the HID Parser Library to versions where bounds checking has been rigorously implemented for all descriptor parsing routines. Developers should ensure that every access to buffer indices includes validation against maximum allowed lengths before execution. Beyond patching, system administrators can reduce the attack surface by restricting physical USB port usage through group policies or hardware locks in high-security environments, thereby limiting who can connect HID devices capable of triggering this flaw. Additionally, enabling memory protection features such as Data Execution Prevention (DEP) and Address Space Layout Randomization (ASLR) on operating systems can mitigate the potential impact of information disclosure by making it harder for attackers to predict memory layouts or execute code based on leaked addresses. Regular security audits focusing on input validation in device driver stacks are essential to prevent similar out-of-bounds errors from persisting in other components of the system software stack.