An issue was discovered in Joomla! 3.0.0 through 3.10.6 & 4.0.0 through 4.1.0. Extracting an specifilcy crafted tar package could write files outside of the intended path.
http://packetstormsecurity.com/files/166546/Joomla-4.1.0-Zip-Slip-File-Overwrite-Path-Traversal.html