4.2% CPI Looks Hot. The Internals Say Be Careful. May CPI came in at 4.2% y/y, the highest print since April 2023, so the knee-jerk market reaction is obvious: sell first, debate the details later. I think that read is too lazy. This is a bad inflation headline, but not yet a clean overheating print. Energy did the damage Energy accounted for over 60% of the monthly CPI increase, with the energy index up 3.9% in May and gasoline up 7.0% m/m. That is not the same thing as every company suddenly regaining pricing power. It is a geopolitical energy shock running through the CPI basket, and those shocks can make headline inflation look much worse than the underlying trend. That distinction matters. A supply shock and a demand shock should not get the same market multiple. Core is the tell Core CPI rose 2.9% y/y and only 0.2% m/m, down from 0.4% in April. That is not soft enough for the Fed to celebrate. But it is also not the kind of acceleration that screams broad-based inflation spiral. Headline says inflation is reheating. Core says the trend is still sticky, still uncomfortable, but not breaking higher in the same way. That is the real read. Where this can get dangerous The market problem is not May gasoline by itself. The problem is pass-through. Airline fares were already up 2.7% m/m, which is exactly the type of category where fuel costs can bleed into services pricing. That is the line the Fed has to watch. The wrong take is “inflation is back everywhere.” The sharper take is “energy is distorting the headline, while core will decide whether this becomes persistent.” Bottom line: 4.2% CPI is ugly, but the details argue against panic. This is an energy-led inflation shock, not yet proof that the entire economy is overheating. For markets, the next trade is less about this CPI print and more about whether gasoline cools before the Fed feels forced to react to a headline it cannot ignore.