curl: Heap Buffer Overflow in Curl_memdup0() via CURLOPT_COPYPOSTFIELDS/CURLOPT_POSTFIELDSIZE Mismatch

Summary A heap buffer overflow vulnerability exists in libcurl's Curlmemdup0 function when handling CURLOPTCOPYPOSTFIELDS operations. The vulnerability occurs when libcurl internally processes POST data where the specified CURLOPTPOSTFIELDSIZE exceeds the actual buffer size of data set via...