CVE-2026-21492 – CVE-2026-21492 is a NULL pointer dereference vu... (How to Fix)

📋 TL;DR

CVE-2026-21492 is a NULL pointer dereference vulnerability in iccDEV library versions before 2.3.1.2 that could cause application crashes or denial of service when processing malicious ICC color profiles. This affects any software using iccDEV for color management operations. The vulnerability requires processing untrusted ICC profiles to be exploitable.

💻 Affected Systems

Products:

iccDEV library
Applications using iccDEV for ICC profile processing

Versions: All versions prior to 2.3.1.2

Operating Systems: All platforms where iccDEV is used

Default Config Vulnerable: ⚠️ Yes

Notes: Only vulnerable when processing ICC color profiles through affected iccDEV library functions

📦 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 causing data loss or service disruption in color-critical applications

🟠

Likely Case

Application crash or unexpected termination when processing malformed ICC profiles

🟢

If Mitigated

Minimal impact if proper input validation and error handling are implemented

🌐 Internet-Facing: LOW - Requires processing of malicious ICC profiles, which are not commonly transmitted over internet-facing services

🏢 Internal Only: MEDIUM - Internal applications processing untrusted ICC files could experience crashes

🎯 Exploit Status

Public PoC: ✅ No

Weaponized: UNKNOWN

Unauthenticated Exploit: ⚠️ Yes

Complexity: LOW

Exploitation requires providing a malicious ICC profile to vulnerable software

🛠️ Fix & Mitigation

✅ Official Fix

Patch Version: 2.3.1.2

Vendor Advisory: https://github.com/InternationalColorConsortium/iccDEV/security/advisories/GHSA-xpq3-v3jj-mgvx

Restart Required: Yes

Instructions:

1. Update iccDEV library to version 2.3.1.2 or later
2. Recompile any applications using iccDEV with the updated library
3. Restart affected applications

🔧 Temporary Workarounds

Input validation

all

Implement strict validation of ICC profile files before processing

Sandbox processing

all

Isolate ICC profile processing in separate containers or sandboxes

🧯 If You Can't Patch

Implement strict file validation for all ICC profile inputs
Monitor application logs for crashes related to ICC profile processing

🔍 How to Verify

Check if Vulnerable:

Check if applications link to iccDEV library version < 2.3.1.2

Check Version:

ldd <application> | grep iccDEV or check library version in package manager

Verify Fix Applied:

Verify iccDEV library version is 2.3.1.2 or later and applications have been recompiled

📡 Detection & Monitoring

Log Indicators:

Application crashes when processing ICC files
Segmentation faults in color management functions

Network Indicators:

Unusual ICC profile file transfers to vulnerable systems

SIEM Query:

Application logs containing 'segmentation fault' AND 'icc' OR 'color profile'

📊 Metadata

CVE ID: CVE-2026-21492

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-252

EPSS Score: 0.01% exploit probability (1.7th percentile)

Published: January 6, 2026

Last Updated: January 12, 2026

🔗 References

https://github.com/InternationalColorConsortium/iccDEV/commit/b200a629ada310137d6ae5c53fc9e6d91a4b0dae Patch
https://github.com/InternationalColorConsortium/iccDEV/commit/e72361d215351cbac0002466c4f936e94d6a99e7 Patch
https://github.com/InternationalColorConsortium/iccDEV/issues/394 Issue Tracking,Exploit,Vendor Advisory
https://github.com/InternationalColorConsortium/iccDEV/pull/401 Patch
https://github.com/InternationalColorConsortium/iccDEV/security/advisories/GHSA-xpq3-v3jj-mgvx Patch,Vendor Advisory
https://github.com/InternationalColorConsortium/iccDEV/issues/394 Issue Tracking,Exploit,Vendor Advisory

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