The npm package @immobiliarelabs/backstage-plugin-ldap-auth contains malicious code embedded in its binding.gyp file. This file uses GYP command-expansion syntax that causes node-gyp to execute attacker-controlled shell commands during installation, leading to arbitrary code execution under the user running npm install. The package masquerades as an LDAP authentication plugin for Backstage but includes unnecessary native addon build steps that enable this malicious behavior. Multiple specific versions of the package are affected.