The libcurl API function called curl_maprintf() before version 7.51.0 can be tricked into doing a double-free due to an unsafe size_t multiplication, on systems using 32 bit size_t variables.
curl_maprintf()
size_t
{ "versions": [ { "introduced": "0" }, { "fixed": "7.51.0" } ] }
"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2016-8618.json"