CVE-2026-21500 – CVE-2026-21500 is a stack overflow vulnerabilit... (How to Fix)

📋 TL;DR

CVE-2026-21500 is a stack overflow vulnerability in iccDEV's XML calculator macro expansion that could allow attackers to execute arbitrary code or cause denial of service. This affects all systems using iccDEV libraries or tools for ICC color management profile manipulation. The vulnerability exists in versions prior to 2.3.1.2.

💻 Affected Systems

Products:

iccDEV libraries and tools

Versions: All versions < 2.3.1.2

Operating Systems: All platforms running iccDEV

Default Config Vulnerable: ⚠️ Yes

Notes: Vulnerability triggers when processing XML calculator macros in ICC profiles

📦 What is this software?

Iccdev by Color

View all CVEs affecting Iccdev →

⚠️ Risk & Real-World Impact

🔴

Worst Case

Remote code execution leading to complete system compromise, data theft, or persistent backdoor installation

🟠

Likely Case

Application crash or denial of service affecting color management functionality

🟢

If Mitigated

Contained application crash with no system-level impact if proper sandboxing exists

🌐 Internet-Facing: MEDIUM - Requires specific XML input processing, not directly network-exposed by default

🏢 Internal Only: MEDIUM - Could be exploited via malicious ICC profiles or XML inputs in internal workflows

🎯 Exploit Status

Public PoC: ✅ No

Weaponized: UNKNOWN

Unauthenticated Exploit: ⚠️ Yes

Complexity: MEDIUM

Exploitation requires crafting malicious XML calculator macros in ICC profiles

🛠️ Fix & Mitigation

✅ Official Fix

Patch Version: 2.3.1.2

Vendor Advisory: https://github.com/InternationalColorConsortium/iccDEV/security/advisories/GHSA-4h4j-mm9w-2cp4

Restart Required: Yes

Instructions:

1. Update iccDEV to version 2.3.1.2 or later
2. Rebuild any applications using iccDEV libraries
3. Restart affected services

🔧 Temporary Workarounds

Input validation for ICC profiles

all

Implement strict validation of XML calculator macros in ICC profiles before processing

Sandbox iccDEV processing

all

Run iccDEV operations in isolated containers or sandboxed environments

🧯 If You Can't Patch

Implement network segmentation to isolate systems using iccDEV
Monitor for abnormal process crashes or memory usage in iccDEV applications

🔍 How to Verify

Check if Vulnerable:

Check iccDEV version using 'iccdev --version' or examine package manager output

Check Version:

iccdev --version

Verify Fix Applied:

Confirm version is 2.3.1.2 or higher and test with known safe ICC profiles

📡 Detection & Monitoring

Log Indicators:

Segmentation faults in iccDEV processes
Abnormal memory usage patterns
Repeated process crashes

Network Indicators:

Unusual ICC profile uploads to applications using iccDEV

SIEM Query:

process_name:iccdev AND (event_type:crash OR memory_usage > threshold)

📊 Metadata

CVE ID: CVE-2026-21500

CVSS v3 Score: 5.5 (MEDIUM)

CVSS Vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H

CWE: CWE-20

EPSS Score: 0.02% exploit probability (4.4th percentile)

Published: January 7, 2026

Last Updated: January 9, 2026

🔗 References

https://github.com/InternationalColorConsortium/iccDEV/commit/cce5f9b68a6c067b7ef898ccd5b000770745fb14 Patch
https://github.com/InternationalColorConsortium/iccDEV/commit/f295826a6f15add90490030f23b2ddd8593bff5b Patch
https://github.com/InternationalColorConsortium/iccDEV/issues/384 Exploit,Issue Tracking
https://github.com/InternationalColorConsortium/iccDEV/pull/406 Issue Tracking
https://github.com/InternationalColorConsortium/iccDEV/security/advisories/GHSA-4h4j-mm9w-2cp4 Third Party Advisory

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🔗 Related Vulnerabilities

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