CVE-2023-32006 in Node.js
Summary
by MITRE • 08/15/2023
The use of `module.constructor.createRequire()` can bypass the policy mechanism and require modules outside of the policy.json definition for a given module. This vulnerability affects all users using the experimental policy mechanism in all active release lines: 16.x, 18.x, and, 20.x. Please note that at the time this CVE was issued, the policy is an experimental feature of Node.js.
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Analysis
by VulDB Data Team • 05/07/2026
The vulnerability identified as CVE-2023-32006 represents a critical security flaw in Node.js's experimental policy mechanism that allows unauthorized module loading bypasses. This issue specifically targets the module.constructor.createRequire() functionality which can circumvent the intended restrictions imposed by policy.json files. The flaw exists within Node.js versions 16.x, 18.x, and 20.x, affecting all users who have enabled the experimental policy feature. The policy mechanism was designed to provide a security layer by defining which modules can be loaded and executed within a given context, but this vulnerability undermines that fundamental security control. The experimental nature of the policy feature at the time of vulnerability disclosure does not diminish its severity, as it still represents a bypass of intended security boundaries.
The technical implementation of this vulnerability stems from how Node.js handles module creation and require function generation within the policy enforcement context. When module.constructor.createRequire() is invoked, it creates a new require function that operates outside the normal policy enforcement boundaries established by policy.json. This occurs because the createRequire method does not properly validate against the policy restrictions that should govern module loading. The flaw essentially allows attackers to dynamically load modules that would otherwise be restricted by the policy configuration, effectively creating a backdoor through which unauthorized code can be executed. This bypass mechanism operates at the runtime level where the policy enforcement should be active but fails to properly restrict the module loading capabilities.
The operational impact of CVE-2023-32006 is significant for organizations using Node.js applications with experimental policy mechanisms enabled. Attackers who can exploit this vulnerability gain the ability to load arbitrary modules that should be restricted by the policy configuration, potentially leading to code execution, data exfiltration, or privilege escalation. The vulnerability can be particularly dangerous in environments where strict module access controls are implemented as a security measure. From an attack perspective, this bypass allows threat actors to circumvent security controls that were specifically designed to prevent unauthorized module loading, making it easier to execute malicious code or access restricted system resources. The impact extends beyond simple bypass scenarios as it fundamentally undermines the security model that the policy feature was designed to enforce.
Security mitigations for this vulnerability primarily involve avoiding the use of the experimental policy feature until a patched version is available, or implementing additional runtime protections that monitor for suspicious module loading patterns. Organizations should consider disabling the experimental policy mechanism entirely while awaiting official patches from Node.js maintainers. The recommended approach involves either upgrading to patched Node.js versions once available or implementing application-level controls that monitor require function calls and validate module loading against expected patterns. Additionally, security teams should conduct thorough audits of applications that rely on experimental policy features to identify potential exploitation vectors. This vulnerability aligns with CWE-284 Access Control Bypass and can be mapped to ATT&CK technique T1548.005 Application Access Token for privilege escalation scenarios. The vulnerability demonstrates how experimental features, while potentially useful, can introduce security risks that may not be fully understood until they are exploited in real-world scenarios.