malicious URLs may present credentials to wrong server

git security advisory reports:

Git uses external “credential helper” programs to store and retrieve passwords or
other credentials from secure storage provided by the operating system.
Specially-crafted URLs that contain an encoded newline can inject unintended values
into the credential helper protocol stream, causing the credential helper to retrieve
the password for one server for an HTTP request being made to another
server, resulting in credentials for the former being sent to the
latter.