ImageMagick convert:not authorized

Hello,
I had this issue while trying to convert some images into a pdf document whith ImageMagick, even with sudo.

https://stackoverflow.com/questions/42928765/convertnot-authorized-aaaa-error-constitute-c-readimage-453/52661288#52661288

The workaround indicated in the topic worked well, but when I see the note on top of the post, I wonder if I should let things like this, or use a more reliable solution (it's on my local machine, not a server) :


Note: the solution in this and other answers involves disabling safety measures that are there to fix arbitrary code execution vulnerabilities. See for instance this ghostscript-related and this ubuntu-related announcement. Only go forward with these solutions if the input to convert comes from a trusted source.