{"description":"Trending threats, MITRE ATT\u0026CK coverage, and detection metadata. Fed continuously.","feed_url":"https://feed.craftedsignal.io/tags/javascript-sandbox/feed.json","home_page_url":"https://feed.craftedsignal.io/","items":[{"_cs_actors":[],"_cs_cpes":[],"_cs_cves":[],"_cs_exploited":false,"_cs_has_poc":false,"_cs_poc_references":[],"_cs_products":["vm2"],"_cs_severities":["high"],"_cs_tags":["javascript-sandbox","code-execution","vm2"],"_cs_type":"advisory","_cs_vendors":["vm2"],"content_html":"\u003cp\u003eA 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.\u003c/p\u003e\n\u003ch2 id=\"attack-chain\"\u003eAttack Chain\u003c/h2\u003e\n\u003col\u003e\n\u003cli\u003eAn attacker crafts malicious JavaScript code designed to exploit the vm2 vulnerability.\u003c/li\u003e\n\u003cli\u003eThe attacker delivers the malicious JavaScript code to a server or application that utilizes vm2 for sandboxed execution.\u003c/li\u003e\n\u003cli\u003eThe vm2 sandbox attempts to execute the malicious code.\u003c/li\u003e\n\u003cli\u003eDue to the vulnerability, the malicious code bypasses the intended security restrictions of the sandbox.\u003c/li\u003e\n\u003cli\u003eThe malicious code gains unauthorized access to the underlying Node.js environment.\u003c/li\u003e\n\u003cli\u003eThe attacker executes arbitrary code within the Node.js process, outside the intended sandbox.\u003c/li\u003e\n\u003cli\u003eThe attacker leverages the code execution to perform actions such as reading sensitive data or establishing persistence.\u003c/li\u003e\n\u003cli\u003eThe attacker potentially compromises the entire host system, depending on the privileges of the Node.js process.\u003c/li\u003e\n\u003c/ol\u003e\n\u003ch2 id=\"impact\"\u003eImpact\u003c/h2\u003e\n\u003cp\u003eSuccessful 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.\u003c/p\u003e\n\u003ch2 id=\"recommendation\"\u003eRecommendation\u003c/h2\u003e\n\u003cul\u003e\n\u003cli\u003eImplement detection rules to identify suspicious activity related to vm2 execution, focusing on attempts to escape the sandbox environment (see Sigma rule examples below).\u003c/li\u003e\n\u003cli\u003eClosely monitor the execution of vm2 sandboxes for unexpected behavior such as file system access or network connections originating from the sandbox.\u003c/li\u003e\n\u003c/ul\u003e\n","date_modified":"2026-05-11T10:48:49Z","date_published":"2026-05-11T10:48:49Z","id":"https://feed.craftedsignal.io/briefs/2026-05-vm2-code-exec/","summary":"A remote, anonymous attacker can exploit a vulnerability in vm2 to execute arbitrary code, potentially leading to arbitrary code execution on the host system.","title":"vm2 Vulnerability Allows Code Execution","url":"https://feed.craftedsignal.io/briefs/2026-05-vm2-code-exec/"}],"language":"en","title":"CraftedSignal Threat Feed — Javascript-Sandbox","version":"https://jsonfeed.org/version/1.1"}