This is misinformed. Taint mode only gets enabled when running a script under differing real and effective user or group ids. Otherwise taint mode needs to be explicitly enabled in the script using the -T command line/hashbang. See perlsec.

Enforcing taint would mean a lot more programming effort in each script since even system() or open() won't work easily without explicit untainting.

In reply to Re^4: How to disable taint checking by Perl? by Corion
in thread How to disable taint checking by Perl? by dissident

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