In Quarkus' RESTEasy Reactive component, usage of File.createTempFile() class in the FileBodyHandler class causes temp files to be created with -rw-r--r-- permissions.
This issue has been addressed in the following products: Red Hat build of Quarkus 2.13.8 Via RHSA-2023:3809 https://access.redhat.com/errata/RHSA-2023:3809