It's very similar with the problem that XS has with the UTF8 flag. It's a common mistake to treat strings internally encoded as iso-latin-1 no differently than strings internally encoded as utf-8, and to lose that info when passing derived strings back to Perl.

In reply to Re^2: MIME::Base64 decode_base64 not tainted by ikegami
in thread MIME::Base64 decode_base64 not tainted by Anonymous Monk

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