From today until March 15, 2026, the maximum lifetime for a TLS certificate is 398 days.
As of March 15, 2026, the maximum lifetime for a TLS certificate will be 200 days.
As of March 15, 2027, the maximum lifetime for a TLS certificate will be 100 days.
As of March 15, 2029, the maximum lifetime for a TLS certificate will be 47 days.
What’s everyone’s opinion on this? I think from a security standpoint their reasoning is valid and in many cases it’s very easy to automate the renewal with ACME or something else. But there’s likely gonna be legacy stuff still around in 2029 that won’t be easy to automate.
The browser warning appears even for a cert issued by a non public CA you have told your browser to trust, and most browsers already enforce a 398 day limit, so unless you have cooperative users, you’re already (effectively) capped at 1 year of validity.
No, that’s fortunately not correct. TLS certificates issued by our CA are valid for 2 years and that works perfectly fine in all the browsers I have ever used.