A new IPC Acute Malnutrition Analysis reveals a 34% increase in acute malnutrition among children under five in Yemen's GoY-controlled areas, affecting over 600,000 children, including 120,000 severely malnourished. The crisis, driven by cholera, measles, high food insecurity, and economic decline, also affects 223,000 pregnant and lactating women. For the first time, extremely critical acute malnutrition (IPC AMN phase 5) was reported in Hodeidah and Taizz lowlands. The upcoming lean season is expected to worsen the situation, with all 117 districts in GoY-controlled areas projected to experience serious malnutrition, and four districts potentially slipping into famine. UNICEF and other aid organizations are calling for urgent intervention to prevent further morbidity and mortality.