The 200-Day Certificate Era: Industry Mandates Shorter TLS Lifespans in 2026

The CA/Browser Forum's reduction of TLS certificate validity periods from 398 to 200 days starting March 2026 signals a fundamental shift in how the web manages certificate lifecycles. This change forces organizations to abandon manual renewal processes and adopt continuous automation, simultaneously reducing security risks from stale validation data and compromised keys. For most enterprises, this represents a critical operational transformation requiring immediate inventory assessment and infrastructure overhaul before the March deadline.