This update for zsh to version 5.6 fixes the following security issues:
CVE-2018-0502: The beginning of a #! script file was mishandled, potentially
leading to an execve call to a program named on the second line (bsc#1107296).
CVE-2018-13259: Shebang lines exceeding 64 characters were truncated,
potentially leading to an execve call to a program name that is a substring of
the intended one (bsc#1107294).