In Quebec, the OQLF [0] recommends "bidouilleur" (which I've heard) and "fouineur" (which makes sense, but isn't really common) instead of hacker [1].

Most media outlets will use "pirate informatique" (or just "pirate") when talking about hackers, and "piratage" for hacking. Example: [2]

[0] https://en.wikipedia.org/wiki/Office_qu%C3%A9b%C3%A9cois_de_...

[1] https://vitrinelinguistique.oqlf.gouv.qc.ca/resultats-de-rec...

[2] https://www.lapresse.ca/actualites/justice-et-faits-divers/2...