A flaw was found in zsh prior 5.0.7. There is a buffer overflow for very long fds in >& fd syntax. References: https://sourceforge.net/p/zsh/code/ci/49a3086bb67575435251c70ee598e2fd406ef055
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