A malicious package named jquery.ui.core version 9999.0.0 was published to the npm registry as a dependency-confusion attack. The package contains an empty module but includes a preinstall script that collects environment and system information, including hostnames, usernames, current working directory, npm registry configuration, and CI repository identifiers. This information is sent via an unencrypted HTTP request to a remote server. The package is designed to identify internal build systems that mistakenly resolve private package names to the public npm registry.