FreeBSD: VID-833b469b-5247-11ee-9667-080027f5fec9 (CVE-2023-38039): curl -- HTTP headers eat all memory

selmelc on hackerone reports: When curl retrieves an HTTP response, it stores the incoming headers so that they can be accessed later via the libcurl headers API. However, curl did not have a limit in how many or how large headers it would accept in a response, allowing a malicious server to stream an endless series of headers and eventually cause curl to run out of heap memory.