The Norwegian government has updated its travel restrictions
from July 26th:
If you are traveling from a green country (list may be found here), but stopover in a country with stricter
quarantine requirements (orange, red, dark red), the entry rules
from the country you are stopping in apply when you arrive in
Norway. If you are not a Norwegian citizen and you have a stopover
in a country that is not green, you do not have the right to enter
Norway (unless you are fully vaccinated and can document this with
the EU Corona certificate).
Countries in Europe
Changes will be made for several countries in Europe from
26th of July.
Travelers from the following countries will have entry
restrictions and entry quarantines from of July 26th: Estonia,
Liechtenstein and Switzerland (these countries go from green to
orange, same rules apply to orange countries as to red countries.
There may be changes in the future).