CyberRota Analysis
AI-GeneratedThe vm2 library versions up to 3.11.6 are vulnerable due to a bypass in the builtin-module denylist, allowing sandboxed code to access restricted filesystem APIs, such as fs/promises, despite explicit denials. This vulnerability can lead to unauthorized file creation and manipulation, posing significant risks to applications relying on vm2 for secure execution of untrusted code. Developers and organizations using vm2 in their Node.js applications should prioritize upgrading to version 3.11.7 to mitigate this high-severity risk.
Public Exploit Signal
A public exploit, PoC, GitHub repository or Metasploit reference was detected for this CVE.
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Original NVD Description
vm2 through 3.11.6 contains a builtin-module denylist bypass in NodeVM. When the embedder uses the builtin wildcard together with negative entries (e.g. require: { builtin: ['*', '-fs', '-child_process'] }), negative entries are matched by exact module name in lib/builtin.js, so -fs removes only the builtin named fs and does not remove builtin subpaths such as fs/promises. Sandboxed code can therefore call require('fs/promises') or require('node:fs/promises') and reach the promise-based filesystem API despite fs being denied; node: prefix handling is likewise inconsistent (a -node:fs/promises entry does not block require('fs/promises')). Host file creation and writing were confirmed via fsp.writeFile(), and other fs/promises operations (cp, mkdir, rename, rm, rmdir, truncate, read operations, etc.) are also reachable. This issue is fixed in vm2 3.11.7.