MAL-2026-5852 Malicious code in richtext-editor-ui (npm)

On npm install, postinstall.js base64-decodes a hardcoded URL (https://www.jsonkeeper.com/b/7EBZP), fetches its body via axios, and pipes the response into a detached, unref'd node child process through stdin — running arbitrary attacker-supplied JavaScript on the installer's machine without consent. The URL constant is misleadingly named DEV_API_KEY to disguise its purpose, and jsonkeeper.com is an anonymous mutable paste host where the served payload can be changed at any time. The package metadata also does not match its name: description, keywords (lambda, publish, compose, modular), and an index.js error message referencing 'theta' indicate the package is a lure published under a richtext-editor-shaped name to attract installs unrelated to its real behavior.

Any computer that has this package installed or running should be considered fully compromised. All secrets and keys stored on that computer should be rotated immediately from a different computer. The package should be removed, but as full control of the computer may have been given to an outside entity, there is no guarantee that removing the package will remove all malicious software resulting from installing it.