CVE-2026-21679
📋 TL;DR
CVE-2026-21679 is a heap buffer overflow vulnerability in iccDEV's CIccLocalizedUnicode::GetText() function that could allow attackers to execute arbitrary code or cause denial of service. This affects all applications using iccDEV libraries for ICC color profile processing prior to version 2.3.1.2. Users of software that incorporates iccDEV for color management are potentially vulnerable.
💻 Affected Systems
- iccDEV library and any software using iccDEV for ICC color profile processing
📦 What is this software?
Iccdev by Color
⚠️ Risk & Real-World Impact
Worst Case
Remote code execution leading to complete system compromise, data theft, or ransomware deployment
Likely Case
Application crash or denial of service affecting color processing functionality
If Mitigated
Contained application crash with no system-level impact if proper sandboxing exists
🎯 Exploit Status
Exploitation requires crafting malicious ICC color profiles and getting them processed by vulnerable software
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: 2.3.1.2
Vendor Advisory: https://github.com/InternationalColorConsortium/iccDEV/security/advisories/GHSA-h4wg-473g-p5wc
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 applications/services.
🔧 Temporary Workarounds
Input validation for ICC profiles
allImplement strict validation of ICC color profiles before processing
Sandbox color processing
allRun iccDEV operations in isolated containers or sandboxes
🧯 If You Can't Patch
- Implement network segmentation to isolate systems using iccDEV
- Deploy application allowlisting to prevent execution of untrusted software that might process malicious ICC files
🔍 How to Verify
Check if Vulnerable:
Check if applications link to iccDEV libraries version < 2.3.1.2 using ldd (Linux) or dependency walker toolsCheck Version:
For compiled applications: strings binary_name | grep iccDEV || ldd binary_name | grep iccVerify Fix Applied:
Verify iccDEV version is 2.3.1.2 or higher and applications have been rebuilt with updated libraries📡 Detection & Monitoring
Log Indicators:
- Application crashes with segmentation faults in color processing functions
- Unusual memory access patterns in application logs
Network Indicators:
- Unexpected uploads/downloads of ICC profile files (.icc, .icm)
SIEM Query:
source="application_logs" AND ("segmentation fault" OR "heap overflow" OR "buffer overflow") AND process="*color*" OR process="*icc*"🔗 References
- https://github.com/InternationalColorConsortium/iccDEV/commit/2eb25ab95f0db7664ec3850390b6f89e302e7039
- https://github.com/InternationalColorConsortium/iccDEV/issues/328
- https://github.com/InternationalColorConsortium/iccDEV/pull/329
- https://github.com/InternationalColorConsortium/iccDEV/security/advisories/GHSA-h4wg-473g-p5wc
