The subject line of SSL certificates are truncated after 256 characters as reported by curl -v. For example
curl -v https://www.paypal.com
* Server certificate:
* subject: 22.214.171.124.4.1.3126.96.36.199.3=US; 188.8.131.52.4.1.3184.108.40.206.2=Delaware; businessCategory=Private Organization; serialNumber=3014267; C=US; postalCode=95131-2021; ST=California; L=San Jose; street=2211 N 1st St; O=PayPal, Inc.; OU=PayPal Production; CN=www.paypal.
Note the CN= value truncates "com."
This was hit with curl 7.26.0 but is in all versions since commit https://github.com/bagder/curl/commit/4c9768565ec3a9baf26ac8a547bca6e42cc64fa5#L11L1652.
There appears to be no adverse effects in terms of establishing trust, but the output is confusing to users.
See the downstream Gentoo bug for more details: https://bugs.gentoo.org/show_bug.cgi?id=419703