CVE-2026-21496 – CVE-2026-21496 is a NULL pointer dereference vu... (How to Fix)

Q: What is the severity of CVE-2026-21496?

CVE-2026-21496 has a CVSS score of 5.5 (MEDIUM). CVE-2026-21496 is a NULL pointer dereference vulnerability in iccDEV's signature parser that can cause denial of service. This affects applications using iccDEV libraries for ICC color profile processing. Users of iccDEV versions before 2.3.1.2 are vulnerable.

📋 TL;DR

CVE-2026-21496 is a NULL pointer dereference vulnerability in iccDEV's signature parser that can cause denial of service. This affects applications using iccDEV libraries for ICC color profile processing. Users of iccDEV versions before 2.3.1.2 are vulnerable.

💻 Affected Systems

Products:

iccDEV library and tools

Versions: All versions before 2.3.1.2

Operating Systems: All platforms running iccDEV

Default Config Vulnerable: ⚠️ Yes

Notes: Any application using iccDEV libraries to parse ICC color profiles is affected.

📦 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-critical workflows in design, printing, or imaging applications.

🟠

Likely Case

Application instability or crash when processing malformed ICC color profiles, requiring restart of affected software.

🟢

If Mitigated

Minimal impact with proper input validation and error handling in place; application may log errors but continue functioning.

🌐 Internet-Facing: LOW - Requires processing of attacker-controlled ICC files, typically not directly internet-exposed functionality.

🏢 Internal Only: MEDIUM - Internal applications processing untrusted ICC files could experience service disruption.

🎯 Exploit Status

Public PoC: ✅ No

Weaponized: UNKNOWN

Unauthenticated Exploit: ⚠️ Yes

Complexity: LOW

Exploitation requires providing a specially crafted ICC profile file to the vulnerable parser.

🛠️ Fix & Mitigation

✅ Official Fix

Patch Version: 2.3.1.2

Vendor Advisory: https://github.com/InternationalColorConsortium/iccDEV/security/advisories/GHSA-wj8m-6w77-r4rw

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 files

all

Implement strict validation of ICC profile files before processing with iccDEV

Sandbox ICC processing

all

Isolate ICC profile processing in separate containers or processes to limit crash impact

🧯 If You Can't Patch

Implement strict file upload controls to prevent untrusted ICC files from reaching vulnerable systems
Monitor application logs for crashes related to ICC profile processing and implement automated restart mechanisms

🔍 How to Verify

Check if Vulnerable:

Check if iccDEV version is below 2.3.1.2 using the version check command

Check Version:

iccdev --version or check library version in application dependencies

Verify Fix Applied:

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

📡 Detection & Monitoring

Log Indicators:

Application crashes with segmentation faults when processing ICC files
Error logs mentioning iccDEV signature parser failures

Network Indicators:

Unusual uploads of ICC profile files to affected systems

SIEM Query:

source="application_logs" AND ("segmentation fault" OR "null pointer" OR "iccdev")

📊 Metadata

CVE ID: CVE-2026-21496

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/0e51ceb427925b7e22f0465547df7506d35cda1c Patch
https://github.com/InternationalColorConsortium/iccDEV/commit/b5ad23aceece3789bdf1c47bae1ecf9d7bfcd26d Patch
https://github.com/InternationalColorConsortium/iccDEV/issues/381 Exploit,Issue Tracking
https://github.com/InternationalColorConsortium/iccDEV/pull/405 Issue Tracking
https://github.com/InternationalColorConsortium/iccDEV/security/advisories/GHSA-wj8m-6w77-r4rw Third Party Advisory

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🔗 Related Vulnerabilities

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