The transform-react-constant-elements npm package versions 9.9.0 and 9.9.1 contain malicious code that installs a dependency from a custom domain which executes an information stealer during installation. This malware targets sensitive tokens related to npm, git, and CI/CD environments. Systems with this package installed should be considered fully compromised, and all secrets and keys stored on those systems must be rotated immediately from a secure, unaffected machine.