This governance item is not attributable to a single vendor; it reflects a systemic cryptographic readiness gap across OT/ICS environments in energy, water, manufacturing, and transportation sectors, where legacy RSA, ECC, and Diffie-Hellman implementations face harvest-now-decrypt-later collection by nation-state actors while post-quantum cryptography tooling and migration frameworks remain immature for operational technology constraints. No patch exists; immediate mitigation centers on network egress hardening, cryptographic asset inventory, and disabling unnecessary external encrypted tunnels. Organizations should initiate a formal PQC readiness assessment aligned to NIST IR 8413 and NIST FIPS 203/204/205, and review existing regulatory attestations for accuracy against operational capability in consultation with legal and compliance leadership.