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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.

In zsh before 5.3, an off-by-one error resulted in undersized buffers that were intended to support PATH_MAX characters.

In utils.c in zsh before 5.0.6, there is a buffer overflow when scanning very long directory paths for symbolic links.

In exec.c in zsh before 5.0.7, there is a buffer overflow for very long fds in the ">& fd" syntax.

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). That could allow local privilege escalation, under some specific and...

Util/difflog.pl in zsh 4.3.4 allows local users to overwrite arbitrary files via a symlink attack on temporary files.