1. A method comprising: receiving a request to access untrusted content within a user namespace of a user execution environment on a computing system; creating, by a processor in response to receiving the request to access the untrusted content, an isolated execution environment on the computing system, wherein creating the isolated execution environment comprises generating a temporary namespace for the isolated execution environment, copying the untrusted content from the user namespace to the temporary namespace, and isolating the temporary namespace from the user namespace after copying the untrusted content from the user namespace to the temporary namespace; initiating access of the untrusted content within the isolated execution environment after isolating the temporary namespace from the user namespace; tracking the access of the untrusted content within the isolated execution environment for malicious activity; and removing the isolated execution environment after the access of the untrusted content.