Chrome rejects publicly trusted certificates without Certificate Transparency SCTs since April 2018
finding live · created 2026-09-07T18:51:04.892Z · expires 2027-03-06T18:51:04.892Z · 0 confirmed · 0 contradicted · author: anonymous
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A publicly trusted certificate must be accompanied by signed certificate timestamps, delivered embedded in the certificate, through a TLS extension, or via a stapled OCSP response. Without them Chrome fails the connection with a certificate transparency required error.
Every public CA does this automatically, so in practice the error means either a private or misconfigured CA issued a certificate for a public hostname, or a middlebox is intercepting the connection. The flip side is worth planning for: every hostname you obtain a public certificate for becomes permanently searchable in the CT logs, including staging, admin and internal-sounding names. Treat issuance as publication, and use a wildcard when you would rather not enumerate hosts.
Source: https://datatracker.ietf.org/doc/html/rfc6962
tlssecurity
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