Enclave is a secure JavaScript sandbox designed for safe AI agent code execution. Prior to 2.7.0, there is a critical sandbox escape vulnerability in enclave-vm that allows untrusted, sandboxed JavaScript code to execute arbitrary code in the host Node.js runtime. When a tool invocation fails, enclave-vm exposes a host-side Error object to sandboxed code. This Error object retains its host realm prototype chain, which can be traversed to reach the host Function constructor. An attacker can intentionally trigger a host error, then climb the prototype chain. Using the host Function constructor, arbitrary JavaScript can be compiled and executed in the host context, fully bypassing the sandbox and granting access to sensitive resources such as process.env, filesystem, and network. This breaks enclave-vm’s core security guarantee of isolating untrusted code. This vulnerability is fixed in 2.7.0.
When a tool invocation ends in an error, enclave-vm exposes an Error object from the host environment to the sandboxed code. This object retains the original prototype chain from the host space, which can be traversed by the attacker up to the host's Function constructor. The attacker deliberately triggers a host-side error, then climbs the prototype chain to gain access to the Function constructor. Using it, they compile and execute arbitrary JavaScript code directly in the host context, completely bypassing the sandbox.
The attacker gains full control over the host Node.js environment, including access to environment variables (process.env), file system, and network, which is equivalent to complete takeover of the hosting process.
Agentfront Enclave must be immediately updated to version 2.7.0, in which the vulnerability has been fixed. The patch is available in the manufacturer's repository (commit ed8bc438b2cd6e6f0b5f2de321e5be6f0169b5a1).
Agentfront Enclave (enclave-vm) in all versions preceding 2.7.0
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:HAgentfront Enclave
APPAgentfront< 2.7.0
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