CVE-2026-9503 GNU LibreDWG空指针解引用漏洞

/* * PoC Concept for CVE-2026-9503 * The vulnerability is triggered by parsing a crafted DWG file. * The following is a conceptual representation of the flaw in src/decode.c. */ #include <stdio.h> #include <stdlib.h> typedef struct { int type; } Dwg_Entity; // Simulated vulnerable function void dwg_next_entity_vulnerable(char *file_data) { // Assume file_data is manipulated to return NULL for an entity Dwg_Entity *entity = (Dwg_Entity *)file_data; // Vulnerability: Lack of NULL check before dereferencing // If the crafted file causes entity to be NULL, this crashes printf("Entity type: %d\n", entity->type); } int main() { // Malicious input that would simulate a NULL entity pointer char *malicious_input = NULL; printf("Triggering Null Pointer Dereference...\n"); dwg_next_entity_vulnerable(malicious_input); return 0; }