Javascript-Sandbox — CraftedSignal Threat Feedhttps://feed.craftedsignal.io/tags/javascript-sandbox/Trending threats, MITRE ATT&CK coverage, and detection metadata. Fed continuously.Hugoenhello@craftedsignal.iohello@craftedsignal.ioMon, 11 May 2026 10:48:49 +0000vm2 Vulnerability Allows Code Executionhttps://feed.craftedsignal.io/briefs/2026-05-vm2-code-exec/Mon, 11 May 2026 10:48:49 +0000hello@craftedsignal.iohttps://feed.craftedsignal.io/briefs/2026-05-vm2-code-exec/A remote, anonymous attacker can exploit a vulnerability in vm2 to execute arbitrary code, potentially leading to arbitrary code execution on the host system.A vulnerability in vm2, a JavaScript sandbox, allows a remote attacker to execute arbitrary code. The vulnerability, discovered in May 2026, stems from insufficient isolation between the sandboxed environment and the host system. An attacker could potentially leverage this flaw to escape the sandbox and execute arbitrary commands, leading to complete system compromise. This is particularly concerning for applications that rely on vm2 to execute untrusted JavaScript code, as it could allow malicious code to break free and compromise the underlying infrastructure. The vulnerability is present in unspecified versions of vm2.

Attack Chain

  1. An attacker crafts malicious JavaScript code designed to exploit the vm2 vulnerability.
  2. The attacker delivers the malicious JavaScript code to a server or application that utilizes vm2 for sandboxed execution.
  3. The vm2 sandbox attempts to execute the malicious code.
  4. Due to the vulnerability, the malicious code bypasses the intended security restrictions of the sandbox.
  5. The malicious code gains unauthorized access to the underlying Node.js environment.
  6. The attacker executes arbitrary code within the Node.js process, outside the intended sandbox.
  7. The attacker leverages the code execution to perform actions such as reading sensitive data or establishing persistence.
  8. The attacker potentially compromises the entire host system, depending on the privileges of the Node.js process.

Impact

Successful exploitation of this vulnerability allows an attacker to execute arbitrary code on the host system where vm2 is being used. This can lead to complete system compromise, data theft, and denial of service. The number of potential victims is broad, as many applications utilize vm2 to safely execute untrusted JavaScript. The impact is severe, potentially allowing attackers to gain control of critical infrastructure.

Recommendation

  • Implement detection rules to identify suspicious activity related to vm2 execution, focusing on attempts to escape the sandbox environment (see Sigma rule examples below).
  • Closely monitor the execution of vm2 sandboxes for unexpected behavior such as file system access or network connections originating from the sandbox.
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