CVE-2017-18205

Name of the Vulnerable Software and Affected Versions: zsh versions prior to 5.4

Description: The issue occurs in sh compatibility mode when processing the cd command without an argument if the HOME variable is not set, resulting in a NULL pointer dereference.

Recommendations: For versions prior to 5.4, update to version 5.4 or later to resolve the issue. As a temporary workaround, consider setting the HOME variable before using the cd command in sh compatibility mode.