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The shift to shorter SSL/TLS certificate lifecycles is no longer theoretical—it’s happening now. And for many organisations, October 2026 could be the moment where the impact becomes impossible to ignore.
What Are Short-Lived Certificates?
Short-lived certificates are publicly trusted TLS/SSL certificates used to secure websites, APIs, and internet-facing services, now issued with significantly reduced validity periods. Officially shortened to 200 days in March 2026 and set to decrease further to 100 days in March 2027 and eventually 47 days by 2029.