Add --new-session to prevent CVE-2017-5226 -- bubblewrap escape via TIOCSTI ioctl #8
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fish ( fish-shell/fish-shell#9605 ) and some other programs might not work because of this sometimes breaking change
Nowadays its possible to disable TIOCSTI in the Linux kernel and thus preventing the vulnerability without the extra flag, but many dont do this. If it becomes default in newer kernels and the old ones phase out, this could be reverted.