CVE-2026-102238 in Visual Studio Code
Summary
by MITRE • 10/15/2026
Improper limitation of a pathname to a restricted directory ('path traversal') in Visual Studio Code allows an unauthorized attacker to execute code over a network.
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Analysis
by VulDB Data Team • 10/15/2026
The vulnerability identified as improper limitation of a pathname to a restricted directory, commonly known as path traversal or directory traversal, represents a critical security flaw within the architecture of Visual Studio Code. This specific issue arises from insufficient validation and sanitization mechanisms when processing file paths provided by external inputs or network requests. In secure software design, applications must strictly enforce boundaries that confine user interactions to designated directories, thereby preventing access to sensitive system files or arbitrary code execution vectors outside the intended scope. When this boundary enforcement fails, an attacker can manipulate input strings containing special characters such as dot-dot-slash sequences (../) or encoded variations thereof to navigate up the directory hierarchy and escape the restricted context.
From a technical perspective, the flaw likely resides in how Visual Studio Code handles file system operations initiated through its remote development features or extension APIs. If the application constructs absolute paths by concatenating user-supplied input with base directories without rigorous canonicalization checks, it becomes possible to reference files located outside the allowed workspace root. This lack of strict path normalization allows an unauthorized actor to bypass access controls that are ostensibly designed to isolate project environments from the broader operating system file structure. The consequence is a significant compromise of integrity and confidentiality, as the attacker gains the ability to read sensitive configuration files, source code repositories containing proprietary logic, or potentially overwrite critical application binaries if write permissions are granted through elevated privileges associated with the IDE process.
The operational impact of this vulnerability extends beyond simple data exfiltration due to its potential for remote code execution over a network. By leveraging path traversal to access and modify specific configuration files or by injecting malicious payloads into executable scripts that Visual Studio Code may automatically load, an attacker can achieve arbitrary command execution on the host machine running the IDE. This is particularly dangerous in development environments where users often run applications with elevated privileges to facilitate debugging or deployment tasks. The ability to execute code remotely transforms a local file system vulnerability into a wide-reaching attack vector, potentially allowing lateral movement within corporate networks if the compromised workstation serves as an entry point for further exploitation against other internal systems.
This flaw aligns closely with CWE-22: Improper Limitation of a Pathname to a Restricted Directory and is often associated with ATT&CK technique T1059 Command and Scripting Interpreter, specifically when used in conjunction with remote access capabilities such as those found in T1071 Application Layer Protocol. The severity is heightened by the widespread adoption of Visual Studio Code among enterprise developers who rely on it for secure coding practices; thus, trust in the tool's isolation mechanisms is paramount. Mitigation strategies must focus on implementing strict allow-listing for file paths rather than relying solely on deny-lists which can be bypassed through encoding tricks or alternative path representations. Developers and administrators should ensure that all inputs are canonicalized to their absolute form before processing and verify that the resulting path remains within the permitted directory boundaries using robust string comparison methods.
To address this risk, immediate updates to Visual Studio Code and its associated extensions are required as they likely contain patches for these input validation gaps. Organizations should enforce strict network segmentation policies to limit exposure of development environments to untrusted networks and apply principle of least privilege by running IDE processes with minimal necessary permissions where possible. Regular security audits focusing on file system access patterns within the application codebase can help identify similar weaknesses in other components that handle user-supplied paths, ensuring a comprehensive defense against path traversal attacks across the entire software ecosystem.