"The conflict in Yemen is now the primary driver of the largest food security emergency in the world," Stephen O'Brien, the UN undersecretary general for humanitarian affairs, told the Security Council, AFP reported.
"If there is no immediate action, famine is now a possible scenario for 2017."
The poor Arab country has been engulfed in war since Saudi Arabia launched a bombing campaign in March 2015 to bring back Yemen’s former president Abd Rabbuh Mansur Hadi, a staunch ally of Riyadh, to power and undermine the popular Houthi Ansarullah movement.
About 14 million people – nearly 80 percent of the entire Yemeni population – are in need of food aid, half of whom are severely food insecure, O'Brien said.
At least two million people need emergency food assistance to survive, he added.
The situation is particularly dire for children with some 2.2 million infants now suffering from acute malnourishment – an increase of 53 percent from late 2015.
"Overall, the plight of children remains grim: a child under the age of 10 dying every 10 minutes of preventable causes," O'Brien said.
The Saudi-led coalition's shutdown of the Sana'a airport has had a heavy toll on civilians because medicine cannot be flown in and Yemenis cannot receive treatment abroad.
O'Brien warned that Yemen could run out of wheat within months because foreign banks no longer accept financial transactions with many of the country's commercial banks.
The country is almost entirely dependent on imports, most of which transit through the Hudaydah port, which was bombed by the Saudis in 2015.
O'Brien said the Saudi-led coalition had ordered a vessel carrying four mobile cranes for the port to leave Yemeni waters and it was now awaiting approval from Riyadh to deliver the new equipment.
The cranes will boost the port's capacity to handle humanitarian cargo.
The United Nations is calling for a cease-fire in Yemen to allow urgently needed deliveries of humanitarian aid and to resume political talks on ending the war.
About 10,000 civilians have died in the war, according to UN officials.
Returning from talks in the region, UN envoy Ismail Ould Cheikh Ahmed took a swipe at Yemen's former president for rejecting his peace proposals.
"Hadi continues to criticize the proposals without agreeing to discuss them and this will hinder and impede the path towards peace," the envoy told the council.