Some environments use code-signing as a security mechanism. Arbitrary execution via pickle creates holes in this mechanism, requiring additional mitigations.

Some environments use code-signing as a security mechanism. Arbitrary execution via pickle creates holes in this mechanism, requiring additional mitigations. PEP-551 briefly discusses security motivations and potential mechanisms for environments where code execution is locked down: https://www.python.org/dev/peps/pep-0551/ https://www.python.org/dev/peps/pep-0551/