>>C++/boost could have a bad actor upload malicious code. The only difference is that people probably wouldn't notice for months, because everyone's running decades old versions of boost anyway. Not because they're mindful of security, but because nobody can bother to update it unless the need becomes dire.
This baseless assertion is quite wrong and completely detached from reality. Boost is not a one-man show which is a git commit away from disaster. Boost is a commmunity-driven project where any change to an existing package is subjected to a public review and proposals for new components are performed through a submission process.