The security of exchange platforms is a central issue in the crypto universe. A new attack has highlighted the increased vulnerability of the sector: Bybit, one of the most influential exchanges, suffered an exceptionally large hack, with an estimated loss of 1.5 billion dollars in Ethereum. The incident sheds light on the complexity of attacks targeting crypto infrastructures, as well as the challenges platforms face in protecting their users' funds. According to initial investigations, the attack is attributed to the Lazarus group, a cybercriminal organization affiliated with North Korea, already responsible for several massive hijackings in the sector. Bybit claims it can cover the losses, but the event raises questions about the resilience of exchanges in the face of growing threats.