CVE-2026-21502 – CVE-2026-21502 is a NULL pointer dereference vu... (How to Fix)

Q: What is the severity of CVE-2026-21502?

CVE-2026-21502 has a CVSS score of 5.5 (MEDIUM). CVE-2026-21502 is a NULL pointer dereference vulnerability in iccDEV's XML tag parser that can cause application crashes or denial of service. This affects users of iccDEV libraries and tools for ICC color management profile manipulation. The vulnerability exists in versions before 2.3.1.2.

📋 TL;DR

CVE-2026-21502 is a NULL pointer dereference vulnerability in iccDEV's XML tag parser that can cause application crashes or denial of service. This affects users of iccDEV libraries and tools for ICC color management profile manipulation. The vulnerability exists in versions before 2.3.1.2.

💻 Affected Systems

Products:

iccDEV libraries and tools

Versions: All versions prior to 2.3.1.2

Operating Systems: All platforms running iccDEV

Default Config Vulnerable: ⚠️ Yes

Notes: Any application using iccDEV libraries for ICC profile processing is vulnerable.

📦 What is this software?

Iccdev by Color

View all CVEs affecting Iccdev →

⚠️ Risk & Real-World Impact

🔴

Worst Case

Application crash leading to denial of service, potentially disrupting color management workflows in affected systems.

🟠

Likely Case

Application instability or crashes when processing malformed ICC profiles containing problematic XML tags.

🟢

If Mitigated

Minimal impact with proper input validation and error handling in place.

🌐 Internet-Facing: LOW - Typically used in processing workflows rather than directly exposed services.

🏢 Internal Only: MEDIUM - Could affect internal color management systems and workflows.

🎯 Exploit Status

Public PoC: ✅ No

Weaponized: NO

Unauthenticated Exploit: ⚠️ Yes

Complexity: LOW

Exploitation requires feeding malformed ICC profiles to the vulnerable parser.

🛠️ Fix & Mitigation

✅ Official Fix

Patch Version: 2.3.1.2

Vendor Advisory: https://github.com/InternationalColorConsortium/iccDEV/security/advisories/GHSA-67r8-q3mh-42j6

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

all

Implement strict validation of ICC profile inputs before processing

Error handling

all

Add robust error handling around ICC profile parsing operations

🧯 If You Can't Patch

Isolate iccDEV processing to dedicated systems with limited privileges
Implement monitoring for application crashes related to ICC profile processing

🔍 How to Verify

Check if Vulnerable:

Check iccDEV version using 'iccdev --version' or examine linked library versions

Check Version:

iccdev --version

Verify Fix Applied:

Confirm version is 2.3.1.2 or later and test with known problematic ICC profiles

📡 Detection & Monitoring

Log Indicators:

Application crashes during ICC profile processing
Segmentation fault errors in logs

Network Indicators:

Unusual ICC profile uploads to color management systems

SIEM Query:

source="application.log" AND ("segmentation fault" OR "null pointer" OR "iccdev crash")

📊 Metadata

CVE ID: CVE-2026-21502

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 (4.3th percentile)

Published: January 7, 2026

Last Updated: January 9, 2026

🔗 References

https://github.com/InternationalColorConsortium/iccDEV/commit/d04c236775e89a029f93efcc242fdb1fbc245a1c Patch
https://github.com/InternationalColorConsortium/iccDEV/commit/d9e42a1fb2606e25e498eb94f34f6da89f522e35 Patch
https://github.com/InternationalColorConsortium/iccDEV/issues/368 Exploit,Issue Tracking
https://github.com/InternationalColorConsortium/iccDEV/pull/407 Issue Tracking
https://github.com/InternationalColorConsortium/iccDEV/security/advisories/GHSA-67r8-q3mh-42j6 Third Party Advisory

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🔗 Related Vulnerabilities

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