Insecure Temporary File
In Netflix OSS Hollow, since the Files.exists(parent) is run before creating the directories, an attacker can pre-create these directories with wide permissions. Additionally, since an insecure source of randomness is used, the file names to be created can be deterministically calculated.
CWE-377 - Insecure Temporary File
Creating and using insecure temporary files can leave application and system data vulnerable to attack.