valgrind detects memory leaks when using libcurl (no ssl)
CURL *curl;
CURLcode res;

curl = curl_easy_init();
// ...
curl_easy_cleanup(curl);

==27330==
==27330== HEAP SUMMARY:
==27330==     in use at exit: 34,960 bytes in 2,406 blocks
==27330==   total heap usage: 20,130 allocs, 17,724 frees, 2,511,576 bytes allocated
==27330==
==27330== 40 (20 direct, 20 indirect) bytes in 1 blocks are definitely lost in loss record 383 of 445
==27330==    at 0x4025BD3: malloc (vg_replace_malloc.c:236)
==27330==    by 0x4B173FD: ???
==27330==    by 0x4B17A8B: ???
==27330==    by 0x4B84957: ???
==27330==    by 0x4B849FD: ???
==27330==    by 0x4B72814: ???
==27330==    by 0x4B734C1: ???
==27330==    by 0x4B78DE2: ???
==27330==    by 0x4B7524B: ???
==27330==    by 0x49B2F76: ???
==27330==    by 0x49C9ECB: ???
==27330==    by 0x49BC96A: ???
...