Apache Libcloud before 0.11.1 uses an incorrect regular expression during verification of whether the server hostname matches a domain name in the subject's Common Name (CN) or subjectAltName field of the X.509 certificate, which allows man-in-the-middle attackers to spoof SSL servers via a crafted certificate.
https://github.com/advisories/GHSA-prcq-52f8-fp44
https://svn.apache.org/repos/asf/libcloud/trunk/CHANGES