Safety usually refers specifically to the absence of risks to life and health posed by a system. In a broader sense, mental health as well as the integrity of the environment and other values are also counted as safety.

ISO/IEC DIS 22989 freedom from unacceptable risk

[SOURCE: ISO 4971:2007, 2.24]

ISO/IEC TR 29119-11:2020 expectation that a system does not, under defined conditions, lead to a state in which human life, health, property, or the environment is endangered

[SOURCE: ISO/IEC/IEEE 12207:2017, 3.1.48]

ISTQB - CTAI Syllabus The expectation that a system does not, under defined conditions, lead to a state in which human life, health, property, or the environment is endangered (ISO/IEC/IEEE 12207)

Security refers to the robustness of a system against intentional misuse.