In builtin.c in zsh before 5.4, when sh compatibility mode is used, there is a NULL pointer dereference during processing of the cd command with no argument if HOME is not set.
zsh before 5.0.7 allows evaluation of the initial values of integer variables imported from the environment (instead of treating them as literal numbers).
CVSS 3.0HIGH 7.8·Local·Low privileges·No interaction·EPSS 0.00487·Published 2018-02-27·Will not fixCWE-264