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CISOs Preparing for Shorter TLS Certificate Lifespans

🔐 Shorter maximum TLS certificate lifespans are imminent: starting 15 March 2026 the limit drops from 398 days to 200 days, then to 100 days a year later and eventually to 47 days by 2029. CISOs should prioritize complete, continuously updated certificate inventories and move to automated issuance and renewal — ideally via ACME — to avoid outages. Centralized governance, percentage-based renewal policies, and integrated alerts tied to ticketing systems reduce human error and operational risk.