CVE-2026-40250 OpenEXR整数溢出漏洞

// Proof of Concept for CVE-2026-40250 // This code simulates the integer overflow condition in internal_dwa_compressor.h:1040 #include <stdio.h> #include <stdint.h> int main() { // Simulating channel properties from a crafted EXR file int32_t width = 131072; // Example large width int32_t bytes_per_element = 32768; // Example bytes per element // The vulnerable calculation: int32 arithmetic without cast // Expected valid size: width * bytes_per_element = 4294967296 // Actual int32 result: 0 (due to overflow wrapping) int32_t calculated_size = width * bytes_per_element; printf("Vulnerable Calculation Simulation:\n"); printf("Width: %d\n", width); printf("Bytes per element: %d\n", bytes_per_element); printf("Calculated Size (int32): %d\n", calculated_size); if (calculated_size == 0) { printf("[!] Integer Overflow occurred! Memory allocation would fail or be too small.\n"); printf("[!] This leads to Heap Buffer Overflow when writing image data.\n"); } return 0; }