This legal article explores the growing challenges of cybersecurity and artificial intelligence (AI) in the age of digital transformation. As the number of connected objects and the value of AI grow exponentially, so do the risks of cyber-attacks and technological abuse. Faced with this, the European Union (EU) is putting in place a rigorous regulatory framework, with directives and regulations such as the Cybersecurity Act, the NIS 2 Directive, DORA and the AI Act. These texts aim to secure networks, strengthen the resilience of financial systems, and frame the use of AI according to the associated levels of risk, while ensuring the protection of fundamental rights. The article also shows how these regulations are forcing companies to adapt, with strict technical and organizational measures, including vendor monitoring and rapid reporting of security incidents. At the same time, it stresses the importance of principles such as "by-design", which requires security and compliance to be integrated right from the system design stage. The article anticipates future challenges, where cyberthreats will become more sophisticated with the increased use of AI, requiring dynamic regulation and proactive risk management practices.