All are products of the Broncos’ youth system with only Hala not a member of the Toyota Cup team that reached the Grand Final against Canberra in 2008.
Yow Yeh, who made his debut for Australia last year, has signed a three year extension to his deal as have hooker McCullough and back rower Glenn.
Powerful prop Hala, who burst on to the scene last season, will remain with the Broncos until the end of 2014 while Hunt has agreed to stay for another year.
Broncos coach Anthony Griffin, who coached all five through the club’s under-20s team, was delighted with the news.
“We are very happy to be able to sign these players who have developed through our system from juniors to second-tier players to NRL standard, and onto Test honours already in a couple of cases,” he said.
“The club has worked hard to give these guys the opportunity to play NRL football and they have proven their ability to compete in the best rugby league competition in the world.
“It is also very pleasing for us that they have shown some faith in the club and where it is going by re-signing such significant extensions to their contracts.”