ROME—Pope Francis on Monday warned that antivaccine misinformation was undermining recovery from the pandemic and denounced a “cancel culture” intolerant of traditional values that he said was impeding cooperation among the world’s societies.

The pope’s remarks came in his annual speech to ambassadors accredited to the Holy See, in which he typically highlights urgent international issues. As in previous speeches, he urged greater diplomatic cooperation to address problems including the pandemic, climate change and migration crises in Europe and North America.