Security News

Critical Flaw in 'Isolated-vm' Tool Could Let Attackers Take Over Host Systems

Security Week · 21 Aug 2026

Key Takeaway If your business uses custom software or platforms that run third-party code, ask your developer or vendor whether they use isolated-vm and confirm it has been patched against this vulnerability.

Security researchers have disclosed a critical vulnerability in isolated-vm, a popular tool used by developers to run untrusted JavaScript code in a secure, isolated environment. The flaw is a 'type confusion' bug that can allow an attacker to break out of the sandbox meant to contain code execution, potentially seizing control of the underlying host process.

Isolated-vm is widely used in applications that need to safely execute code from third parties, such as plugins or user-submitted scripts, without risking the security of the main system. This vulnerability undermines that core protection, meaning any application relying on it could be exposed to remote code execution attacks if left unpatched.

While the technical details are complex, the real-world risk is straightforward: software built on this library may be vulnerable to attackers gaining deeper access than intended. Businesses using platforms or custom applications that incorporate isolated-vm should check with their developers or vendors about patch status.

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Summarised by CISO AI from Security Week. We link back to every original so you can read it yourself.