While it's not corn, a new food allergen has now been approved to label.

Major Food Allergens

Congress passed the Food Allergen Labeling and Consumer Protection Act of 2004 (FALCPA). This law identified eight foods as major food allergens: milk, eggs, fish, shellfish, tree nuts, peanuts, wheat, and soybean. On April 23, 2021, the Food Allergy Safety, Treatment, Education, and Research (FASTER) Act was signed into law, declaring sesame as the 9th major food allergen recognized by the United States. This change will become effective on January 1, 2023, so labeling of sesame as an allergen will not be required until that time.