CVE-2026-34542 Overview
A stack-buffer-overflow vulnerability has been discovered in iccDEV, an open-source library and toolset for working with ICC color management profiles. The vulnerability exists in the CIccCalculatorFunc::Apply() function and can be triggered when processing a specially crafted ICC profile via the iccApplyNamedCmm utility.
Critical Impact
A maliciously crafted ICC profile can trigger a 4-byte write stack-buffer-overflow, potentially leading to application crashes or denial of service conditions when color profiles are processed.
Affected Products
- iccDEV versions prior to 2.3.1.6
- Applications using the IccProfLib library for ICC profile processing
- Systems utilizing iccApplyNamedCmm for color management operations
Discovery Timeline
- 2026-03-31 - CVE-2026-34542 published to NVD
- 2026-04-01 - Last updated in NVD database
Technical Details for CVE-2026-34542
Vulnerability Analysis
This vulnerability is classified as CWE-121 (Stack-based Buffer Overflow). The flaw resides in the ICC profile processing logic within the IccProfLib component, specifically in the MPE (Multi-Processing Element) calculator and curve set initialization path.
When a malformed ICC profile is processed, the CIccCalculatorFunc::Apply() function fails to properly validate buffer boundaries before performing write operations. Under AddressSanitizer testing, the vulnerability manifests as a 4-byte write stack-buffer-overflow at IccProfLib/IccMpeCalc.cpp:3873.
The local attack vector requires an attacker to provide a crafted ICC profile to an application using the vulnerable library. This could occur through various scenarios such as processing user-uploaded color profiles, opening documents with embedded ICC profiles, or converting images between color spaces.
Root Cause
The root cause is insufficient boundary checking in the calculator function implementation. The CIccCalculatorFunc::Apply() method does not properly validate the size of data being written to stack-allocated buffers during MPE calculator operations, allowing a crafted profile to cause memory corruption through oversized write operations.
Attack Vector
The attack requires local access where an attacker must provide a crafted ICC profile to be processed by an application using the vulnerable iccDEV library. The attack path flows through the iccApplyNamedCmm utility or any application that initializes MPE calculator curve sets from untrusted ICC profile data.
The vulnerability can be reached through the following general exploitation flow:
- Attacker creates a malformed ICC profile with specific MPE calculator elements
- Target application loads the malicious profile for color transformation
- The CIccCalculatorFunc::Apply() function processes the profile data
- Stack buffer overflow occurs during curve set initialization
- Application crashes, resulting in denial of service
For detailed technical information, refer to the GitHub Security Advisory GHSA-6749.
Detection Methods for CVE-2026-34542
Indicators of Compromise
- Application crashes when processing specific ICC color profiles
- AddressSanitizer reports showing stack-buffer-overflow in IccMpeCalc.cpp
- Segmentation faults in processes using iccDEV library functions
- Unusual ICC profile files with anomalous MPE calculator element structures
Detection Strategies
- Monitor for application crashes or segfaults in services that process ICC profiles
- Implement AddressSanitizer or similar memory safety tools in development and testing environments
- Scan for iccDEV library versions prior to 2.3.1.6 across deployed systems
- Review system logs for repeated failures in color profile processing operations
Monitoring Recommendations
- Enable crash reporting and monitoring for applications utilizing ICC profile processing
- Implement file integrity monitoring for ICC profile directories in production environments
- Configure alerting for unexpected termination of color management services
- Deploy runtime application self-protection (RASP) solutions to detect memory corruption attempts
How to Mitigate CVE-2026-34542
Immediate Actions Required
- Upgrade iccDEV to version 2.3.1.6 or later immediately
- Audit systems for applications using affected versions of the IccProfLib library
- Restrict processing of ICC profiles from untrusted sources until patching is complete
- Enable memory protection mechanisms such as ASLR and stack canaries on affected systems
Patch Information
The vulnerability has been fixed in iccDEV version 2.3.1.6. The patch addresses the boundary checking issue in the CIccCalculatorFunc::Apply() function to prevent stack buffer overflow conditions. Organizations should update to the patched version as soon as possible.
For patch details, see GitHub Pull Request #694.
Additional technical discussion is available in GitHub Issue #678.
Workarounds
- Validate and sanitize all ICC profiles before processing using trusted validation tools
- Implement strict input validation for any user-provided color profiles
- Run ICC profile processing in sandboxed environments with restricted permissions
- Consider using alternative color management libraries until patching can be completed
- Disable or restrict functionality that processes external ICC profiles in production systems
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
