Recent energy price surges tied to Middle East supply constraints have driven headline US CPI to a 4.2% year-over-year peak in May 2026 before easing to 3.4% in August, with energy contributing over 60% of monthly gains in hotter prints. Core CPI, excluding food and energy, has remained more contained near 2.4% in August, reflecting softer underlying services pressures amid 2.4% core readings. Key influences include prior tariff effects, robust AI-related demand boosting goods prices, and resilient domestic spending, while longer-term inflation expectations stay anchored near the Fed’s 2% target. Traders are monitoring the September CPI release on October 14 and the late-October FOMC meeting for signals on whether these supply shocks produce a sustained reacceleration or prove transitory.