The international community is being urged to scale up funding and financial institutions asked to adapt their programs to the food security situation.
"Sudan is experiencing an alarming deterioration in its food security. The risk of famine in the coming months, as warned by the Integrated Food Security Phase Classification, needs urgent action," a joint statement signed by dozens of countries said in a statement released by the US State Department.
The statement was signed by Australia, the US, the UK, France, Germany and the European Commissioner for Equality, Preparedness and Crisis Management, among others.
"The parties to the conflict bear primary responsibility for alleviating the suffering of the Sudanese people."
Sudan's army has been fighting the paramilitary Rapid Support Forces since April 2023, when the two fell out over issues including how to integrate their forces in a planned transition to civilian rule.
In June, the United Nations-backed global hunger monitor, the Integrated Food Security Phase Classification, said 5.1 million people in Sudan faced severe hunger.
Farmers have struggled to harvest their crops since the civil war flared in 2023 and have also recently been battling a drought.
The joint statement urged parties in the conflict to authorise humanitarian operations through all crossline and cross-border routes, including air access into Darfur.
It also called on them to "sustain presence and protection of humanitarian personnel" throughout Sudan and refrain from strikes on civilian infrastructure.
The war has displaced more than 14 million people and unleashed waves of ethnically driven killings.
A UN probe said in July RSF forces carried out mass killings, rapes and forced starvation in a city they besieged and captured last year, as part of an intentional policy amounting to genocide.
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