Grails is a framework used to build web applications with the Groovy programming language. A specially crafted web request can lead to a JVM crash or denial of service. Any Grails framework application using Grails data binding is vulnerable. This issue has been patched in version 3.3.17, 4.1.3, 5.3.4, 6.1.0.
Grails before 3.3.10 used cleartext HTTP to resolve the SDKMan notification service. NOTE: users' apps were not resolving dependencies over cleartext HTTP.