Automatic referer leaks credentials

Open Source Vulnerabilities CVE-2021-22876

curl 7.1.1 to and including 7.75.0 is vulnerable to an "Exposure of Private Personal Information to an Unauthorized Actor" by leaking credentials in the HTTP Referer: header. libcurl does not strip off user credentials from the URL when automatically populating the Referer: HTTP request header field in outgoing HTTP requests, and therefore risks leaking sensitive data to the server that is the target of the second HTTP request.

Open Source Vulnerabilities CURL-CVE-2021-22876

libcurl does not strip off user credentials from the URL when automatically populating the `Referer:` HTTP request header field in outgoing HTTP requests, and therefore risks leaking sensitive data to the server that is the target of the second HTTP request. libcurl automatically sets the `Referer:` HTTP request header field in outgoing HTTP requests if the `CURLOPT_AUTOREFERER` option is set. With the curl tool, it is enabled with `--referer ";auto"`.