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In reply to Fixing the Breakage from the AddTrust External CA Root Expiration

Reader F30 on 2020-05-30 at 23:09:

Are you aware that there is at least one other current Root CA which used to be cross-signed by "AddTrust External CA Root" - "COMODO RSA Certification Authority"? (https://crt.sh/?id=1720081, old cross-signed cert is https://crt.sh/?id=1044348)

Additionally there is another variant of the "USERTrust RSA Certification Authority" cert (https://crt.sh/?id=1282303295) issued by the "AAA Certificate Services" Root CA (https://crt.sh/?id=331986). That one should still be valid until 2028.

However, cURL on macOS 10.14 (built against LibreSSL 2.6.5) also fails to connect to servers sending a security chain containing the latter. This is interesting, since "AddTrust External CA Root" never occurs in that chain. One example for it is https://electroncash.org/.

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