Over 80 per cent of the population in war-torn Yemen is in need of humanitarian aid and many are facing starvation, Oxfam has said.
The charity also warned of the likelihood of a financial crisis in the country, which could further worsen the already dire situation.
The war has killed over 6,000 people, around half of them civilians, and displaced a further 2.4 million.
Over 14 million Yemenis are hungry and 21.2 million - 82 per cent of the population - urgently need humanitarian assistance, according to Oxfam.
The conflict, escalated hugely by a Saudi-led bombing campaign, has caused significant problems for Yemen’s food supply, with rising prices and food becoming less available.
Importers to Yemen are finding it harder to get credit from international banks nervous about involving themselves with such a fragile market.
Charity reveals 'scorched earth' Yemen images
The Central Bank of Yemen is also facing difficulties stabilising food prices.
This could lead to further financial diffuculties for the citizens of a country, which regularly ranks as the poorest in the Middle East.
On a grassroots level, many low income Yemenis have responded to rising prices by buying food on credit, causing debts they cannot repay.
Lenders are now reluctant to provide money to poor families to buy food.
It is feared these factors could result in new food price rises affecting a quarter of the population.
“All the evidence shows that the poorest people do not have the ability to withstand this crisis for much longer,” Oxfam said.
Sajjad Mohamed Sajid, Oxfam's Country Director in Yemen, said: "A brutal conflict on top of an existing crisis, a catastrophe on top of catastrophe, has created one of the biggest humanitarian emergencies in the world today - yet most people are unaware of it.
“Men, women and children are caught between reckless bombing from the sky and indiscriminate shelling on the ground, with nowhere to hide.
"Close to 14.4 million people, more than half of all Yemenis, are hungry and the majority will not be able to withstand the rising prices for food if importers are unable to trade due to a crippled financial system."
The embattled country is dependent on imports for 90 per cent of its food, though the dangerous situation limits what can get into the country.
In addition to Saudi airstrikes which have destroyed farms and markets, agricultural productivity has plummeted because of a fuel crisis related to the conflict.