FreeBSD: VID-897e1962-5d5a-11ec-a3ed-040e3c3cf7e7 (CVE-2021-44542): Privoxy -- Multiple vulnerabilities (memory leak, XSS)

Privoxy reports: cgi_error_no_template(): Encode the template name to prevent XSS (cross-site scripting) when Privoxy is configured to servce the user-manual itself. Commit 0e668e9409c. OVE-20211102-0001. CVE-2021-44543. Reported by: Artem Ivanov get_url_spec_param(): Free memory of compiled pattern spec before bailing. Reported by Joshua Rogers (Opera) who also provided the fix. Commit 652b4b7cb0. OVE-20211201-0003. CVE-2021-44540. process_encrypted_request_headers(): Free header memory when failing to get the request destination. Reported by Joshua Rogers (Opera) who also provided the fix. Commit 0509c58045. OVE-20211201-0002. CVE-2021-44541. send_http_request(): Prevent memory leaks when handling errors Reported by Joshua Rogers (Opera) who also provided the fix. Commit c48d1d6d08. OVE-20211201-0001. CVE-2021-44542.