In line with the Certification Authority Browser Forum's new mandate effective March 2026, AWS updated ACM-issued public certificates to have a maximum lifespan of 198 days, down from the previous 395 days. Existing certificates with longer validity remain functional until renewal or expiration. The change is automatic, requiring no customer intervention, and renewals now occur 45 days before expiry instead of 60.
Pricing for exportable public certificates was adjusted downward to reflect the shorter validity periods. All other ACM functions, including automatic renewal and certificate management features, remain intact following this update.
Source & further reading
AWS Certificate Manager updates default certificate validity to comply with new guidelines ↗Source published 2026-02-18. This report was prepared with AI assistance from the linked primary-source material. Claims and limitations should be checked against the original announcement or research.