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AWS acm high security documentation change

Service: acm · 2026-02-22 · Security-related high

File: acm/latest/userguide/acm-concepts.md

Summary

Reduced certificate validity period from 13 months (395 days) to 198 days

Security assessment

Shorter validity periods reduce exposure window for compromised certificates. Change aligns with CA/B Forum security requirements for public certificates.

Diff

diff --git a/acm/latest/userguide/acm-concepts.md b/acm/latest/userguide/acm-concepts.md
index fa0feb4c8..a34e1c688 100644
--- a//acm/latest/userguide/acm-concepts.md
+++ b//acm/latest/userguide/acm-concepts.md
@@ -56 +56 @@ This section provides definitions of concepts used by AWS Certificate Manager.
-ACM generates X.509 version 3 certificates. Each is valid for 13 months (395 days) and contains the following extensions. 
+ACM generates X.509 version 3 certificates. Each is valid for 198 days and contains the following extensions.