Double Free Vulnerability in `libcurl` Cookie Management (`cookie.c`)

Description: Two **Double Free** vulnerabilities have been identified in the `cookie.c` file of the `libcurl` library. These issues occur due to improper memory management, where the same memory area is freed multiple times under certain conditions. Below are clear steps to reproduce each …

   if (replace_n) {
       struct Cookie *repl = Curl_node_elem(replace_n);
       Curl_node_remove(replace_n); // Remove from the list
       freecookie(repl);            // Free memory (double-free if already removed)
   }