This fixes 2.3 describes in docs/KNOWN_BUGS.
It is fixed by using the ..._dn2 function equivalents which allocate the required length rather than filling it into the fixed one.
The CN field was limited to 64 chars because that's the defined max amount in ASN.1
This function was added in GnuTLS 3.1.10 (Mar 22, 2013), meaning it is much newer than the oldest GnuTLS version we claim to support (2.11.3 is mentioned in docs/INTERNALS.md).
I don't think supporting version 2 is worth it, and perhaps a 7 years old version is enough as oldest legacy GnuTLS to support, but I think this detail should still be checked for so that we can warn users about out-of-age versions and the docs could state the new oldest version we support.
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