Passport validity
The source states no minimum passport validity.
Visa rules · Tourist entry
Entry rules for Svalbard & Jan Mayen from its official sources, and every passport we have a page for.
Svalbard is part of Norway but outside the Schengen area. If you need a Schengen visa, get one with at least two entries so you can return to mainland Norway.
Official sources
The source states no minimum passport validity.
Pick your passport for the full rule, its source quote and the check date.