"Hi, I recently received an alert from a commercial CA regarding a potential issue that may impact certain ACME integrations. Does Let's Encrypt also have this issue?"
In order to answer that, we would need to know:
- Which CA issued the alert.
- What the issue is.
There hasn't been any recent alerts from Let's Encrypt about an issue with ACME and it's unlikely that they're affected by whatever the issue is (unless the other CA was using boulder).
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Why are there quotes (") around your post? 
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