International donors have agreed to transfer $280m (£210) from a frozen fund to UN food and health services in Afghanistan, the World Bank says.
The country faces a deep humanitarian and economic crisis made worse by the removal of financial support after the Taliban seized power in August.
The World Food Programme (WFP) warns that more than half of the population is under threat of acute hunger.
Three million children are suffering from malnutrition.
The situation is the result of a severe drought, which has ruined much of the wheat crop and sent prices soaring, and an economic crisis accelerated by the decision of Western nations to cut off financial aid after the Taliban takeover.
Western powers have refused to recognise the Taliban government officially. The US and other nations have frozen about $10bn of Afghan reserves, while the World Bank and the International Monetary Fund have also halted the country's access to funding.