The ssl.match_hostname function in CPython (aka Python) before 2.7.9 and 3.x before 3.3.3 does not properly handle wildcards in hostnames, which might allow man-in-the-middle attackers to spoof servers via a crafted certificate.
"https://github.com/microsoft/AzureLinuxVulnerabilityData/blob/main/osv/AZL-109599.json"