The zsh shell is a command interpreter usable as an interactive login shell and as a shell script command processor. Zsh resembles the ksh shell (the Korn shell), but includes many enhancements. Zsh supports command-line editing, built-in spelling correction, programmable command completion, shell functions (with autoloading), a history mechanism, and more.
zsh: Stack-based buffer overflow in gen_matches_files() at compctl.c (CVE-2018-1083)
zsh: buffer overflow for very long fds in >& fd syntax (CVE-2014-10071)
zsh: buffer overflow when scanning very long directory paths for symbolic links (CVE-2014-10072)
zsh: NULL dereference in cd in sh compatibility mode under given circumstances (CVE-2017-18205)
zsh: buffer overrun in symlinks (CVE-2017-18206)
zsh: Stack-based buffer overflow in exec.c:hashcmd() (CVE-2018-1071)
zsh: buffer overflow in utils.c:checkmailpath() can lead to local arbitrary code execution (CVE-2018-1100)
zsh: crash on copying empty hash table (CVE-2018-7549)
For more details about the security issue(s), including the impact, a CVSS score, and other related information, refer to the CVE page(s) listed in the References section.
The CVE-2018-1083, CVE-2018-1071, and CVE-2018-1100 issues were discovered by Richard Maciel Costa (Red Hat).
For detailed information on changes in this release, see the Red Hat Enterprise Linux 7.6 Release Notes linked from the References section.