In addition to community-sourced developments, NixOS has a dedicated security team. If the above sources are not enough to answer your question, please reach out to a member of the team listed below.
Rob Vermaas (emeritus)
To privately report a security issue with NixOS, Nix, and its ecosystem, please email a member of the NixOS Security Team and we will ensure the issue is handled. Our responses will be signed with our GPG keys.