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> AFL can fuzz ruby by running ruby on arbitrary inputs.

If you're brave (consider "system rm -rf /home") this is worth doing. I recently ran such a fuzzing test against GNU Awk.

Unfortunately the bugs I reported are still unfixed, but it didn't take too long to find them, and it was a good learning exercise:

I'm sure passing "random" input to Perl, Python, Ruby, and many other languages will lead to similar results.