The James Bond star - who is double-vaccinated and asymptomatic - is appearing in four films at the world's most famous movie festival.
The event is being held in-person on the French Riviera, with organisers insisting they have strict measures to avoid infections.
Even so, rumours of a possible "Cannes cluster" have been circulating.
These have been strongly denied by festival director Thierry Fremaux.
"Yesterday we did more than 3,000 tests (on festival-goers) and we have no positive cases," he said on Saturday. "We are having to say this to show that the rumours of a Cannes cluster are unfounded."