CVE-2020-17521

Apache Groovy provides extension methods to aid with creating temporary
directories. Prior to this fix, Groovy’s implementation of those extension
methods was using a now superseded Java JDK method call that is potentially
not secure on some operating systems in some contexts. Users not using the
extension methods mentioned in the advisory are not affected, but may wish
to read the advisory for further details. Versions Affected: 2.0 to 2.4.20,
2.5.0 to 2.5.13, 3.0.0 to 3.0.6, and 4.0.0-alpha-1. Fixed in versions
2.4.21, 2.5.14, 3.0.7, 4.0.0-alpha-2.