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If a template is provided to Perl's Template Toolkit, can you ensure that the code generation inside Template Toolkit is sufficiently subsetted to be safe?

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No, Template Toolkit suffers from multiple different ways to arbitrarily execute code, like this one used in CVE-2019-1978

[% template.new({ 'BLOCK' => 'use Data::Dumper; print STDERR Dumper(\%ENV); die' }) %] 

Do not trust user-provided templates. This bug is filed upstream here.

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