Vatican Faces Legal Uncertainty Over Governance During Papal Incapacity

Following the recent lung cancer diagnosis and surgery of Pope Leo XIV, the Catholic Church is once again confronting a significant governance dilemma: who holds authority if the Pontiff becomes incapacitated? While clear protocols exist for the death or resignation of a Pope, canon law remains notably silent on procedures for when a living leader is physically or mentally unable to fulfill his duties. This legal vacuum leaves the Holy See without a formal mechanism to transfer executive power.

Currently, the day-to-day administration of the Vatican falls to the Roman Curia, led by the Secretary of State, Cardinal Pietro Parolin. While Parolin manages diplomatic and administrative affairs, he lacks the authority to perform exclusive papal functions, such as appointing bishops or canonizing saints. As expert Felipe Dominguez noted, the system relies on existing departmental roles to maintain continuity, but these officials cannot legally substitute for the Pope’s sovereign decision-making powers.

Canon 335 of the Church’s legal code acknowledges the possibility of the Holy See being "vacant or completely impeded," yet it fails to define the threshold for "complete impediment" or the subsequent steps required to address it. Unlike the specific regulations governing bishops, who can be replaced by coadjutors if incapacitated, there is no equivalent provision for the Supreme Pontiff. This leaves the Church in a precarious position where the Pope’s own will remains the only legal path to transition, provided he is capable of expressing it.

To address these risks, some experts have proposed that the College of Cardinals should assume temporary governance and establish a medical commission to periodically assess the Pope’s health. However, the Vatican has yet to adopt such reforms. Consequently, if a Pope were to suffer from a condition like advanced Alzheimer’s, the Church would face a profound crisis of legitimacy, as current laws require a resignation to be "freely and publicly" declared, a standard that may be impossible to meet in cases of severe cognitive decline.