Language: Python
Label: vulnerable
CWE: CWE-78 \u2014 Improper Neutralization of Special Elements used in an OS Command ('OS Command Injection')
The product constructs all or part of an OS command using externally-influenced input from an upstream component, but it does not neutralize or incorrectly neutralizes special elements that could modify the intended OS command when it is sent to a downstream component.

Code:
    def compat_shlex_quote(s):
        import re
        return s if re.match(r'^[-_\w./]+$', s) else '"%s"' % s.replace('"', '\\"')