The cases, in which employees breached the agency's firewall, appear to be isolated.
Critics of the proposed rule change have already flooded the agency with protests and launched a White House petition against the plan.
Proponents call the commission's decision a temporary setback for the virtual currency.
It would likely be years before the vehicles are deemed street legal.
At the hearing, Rep. Albio Sires (D-N.J.) said he had “so many questions."
The House Transportation and Infrastructure Committee will meet Tuesday to consider the future of self-driving cars.
The hearing is a rescheduled meeting from last month, when the review was canceled in the midst of the federal government shutdown.
The Federal Communications Commission voted unanimously Thursday to loosen rules restricting foreign ownership of broadcast TV and radio stations.
The decision brings the agency's rules for broadcast foreign ownership more in line with its rules for cable companies, wireless carriers and other industries.
A Republican lawmaker says people's personal information could be targeted by hackers.
But the commission would prohibit campaigns from spending the virtual currency.
The Federal Aviation Administration (FAA) has cleared two more airlines for allowing passengers to keep their electronic devices on during the entire lengths of flights.
U.S. Airways and United Airlines have been granted permission to expand in-flight electronic use, making them the fourth and fifth major airlines to receive the OK since the FAA relaxed its rules last week.