Yes, you always need a Hungarian e-vignette unless exempt, even if you drive only one time or a short distance on Hungarian tollroads. Fines apply instantly if you enter Hungary without a valid vignette.
You can order your Hungarian e-vignette now comfortably here.
Related articles:
How is the Hungarian motorway vignette checked?
Can I drive into Hungary without a vignette if I avoid motorways?
What happens if I drive without a Hungarian vignette?
Do I need a vignette if I only transit through Hungary?
Penalties for driving with an expired Hungarian vignette