Subordinate CA OCSP validity limits

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Taavi Eomäe

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Feb 11, 2026, 6:59:29 AM (3 days ago) Feb 11
to S/MIME Certificate WG - Public (CA/B Forum)
Hi,

The S/MIME BR (1.0.12) currently defines OCSP response validity periods for subscriber certificates.

However quite a few CAs also offer OCSP for their subordinate CAs, the BR defines how often (12mo) and how fast (within 24h) the status should be updated, but not how long the responses should be valid.

Is this intentional? Should an implementation only enforce an upper limit of 12 months?


Best Regards,
Taavi Eomäe
Zone Media OÜ

Stephen Davidson

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Feb 11, 2026, 12:54:41 PM (2 days ago) Feb 11
to smcwg-...@groups.cabforum.org

Hello Taavi

 

This OCSP language is consistent in several of the CABF standards.

For sub CAs, that is the only specification.  CAs are free to implement tighter boundaries, but this is the minimum.

 

Regards, Stephen

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