A buffer overflow flaw was found in the zsh shell file descriptor redirection functionality. An attacker could use this flaw to cause a denial of service by crashing the user shell.
A flaw was found in zsh prior 5.0.7. There is a buffer overflow for very long fds in >& fd syntax.
This issue has been addressed in the following products:
Red Hat Enterprise Linux 7
Via RHSA-2018:3073 https://access.redhat.com/errata/RHSA-2018:3073