CVE-2026-31793: iccDEV ICC Color Management DoS Flaw

CVE-2026-31793 Overview

CVE-2026-31793 is an Out-of-Bounds Read vulnerability affecting iccDEV, a set of libraries and tools for working with ICC color management profiles developed by the International Color Consortium. Prior to version 2.3.1.5, a segmentation fault can occur due to an invalid or wild pointer read in the CIccCalculatorFunc::ApplySequence() function, resulting in a denial of service condition.

Critical Impact

This vulnerability allows an attacker to crash applications using the iccDEV library by triggering an invalid pointer read, causing denial of service to color profile processing operations.

Affected Products

• iccDEV versions prior to 2.3.1.5
• Applications and systems utilizing iccDEV libraries for ICC color profile processing
• Any software integrating the vulnerable CIccCalculatorFunc::ApplySequence() function

Discovery Timeline

• 2026-03-10 - CVE CVE-2026-31793 published to NVD
• 2026-03-11 - Last updated in NVD database

Technical Details for CVE-2026-31793

Vulnerability Analysis

This vulnerability is classified as CWE-125 (Out-of-Bounds Read). The root cause lies within the CIccCalculatorFunc::ApplySequence() function in the iccDEV library, where improper pointer validation leads to memory access violations. When processing specially crafted ICC color profiles, the function attempts to read memory at an invalid or wild pointer address, triggering a segmentation fault.

The vulnerability requires local access and user interaction to exploit, as an attacker must convince a user to open or process a maliciously crafted ICC profile file. While this vulnerability does not allow for arbitrary code execution or information disclosure, it can effectively cause denial of service by crashing any application that processes the malformed profile.

Root Cause

The vulnerability stems from insufficient validation of pointer references within the calculator function sequence processing logic. When the ApplySequence() method iterates through calculator operations, it fails to properly verify that memory addresses being accessed are valid and within allocated bounds. This allows an attacker to craft an ICC profile that triggers access to invalid memory regions, causing the application to crash with a segmentation fault.

Attack Vector

The attack requires local access with user interaction. An attacker would need to:

1. Create a maliciously crafted ICC color profile containing data that triggers the invalid pointer condition
2. Convince a victim to open or process this profile using an application that relies on the vulnerable iccDEV library
3. When the application processes the profile and calls CIccCalculatorFunc::ApplySequence(), the invalid pointer read occurs
4. The resulting segmentation fault crashes the application, achieving denial of service

The vulnerability mechanism involves the calculator function sequence processing in the iccDEV library. When parsing certain malformed ICC profile data structures, the ApplySequence() method attempts to dereference a pointer that has not been properly initialized or validated, leading to memory access at an invalid address. Technical details and the specific fix can be found in the GitHub Pull Request #652 and the GitHub Security Advisory.

Detection Methods for CVE-2026-31793

Indicators of Compromise

• Application crashes with segmentation fault errors when processing ICC color profiles
• Unexpected termination of color management services or applications using iccDEV
• Core dumps or crash logs indicating failures in CIccCalculatorFunc::ApplySequence() or related functions
• Repeated denial of service incidents affecting ICC profile processing workflows

Detection Strategies

• Monitor application logs for segmentation fault signals (SIGSEGV) associated with ICC profile processing
• Implement file integrity monitoring for ICC profile directories to detect introduction of potentially malicious profiles
• Deploy endpoint detection rules to identify abnormal crashes in applications known to use iccDEV libraries
• Use static analysis tools to identify applications in your environment that depend on vulnerable iccDEV versions

Monitoring Recommendations

• Enable crash reporting and core dump collection for applications processing ICC color profiles
• Monitor system logs for repeated application terminations related to color management functions
• Implement alerting for unusual patterns of ICC profile file access or processing failures
• Track version information of iccDEV library installations across your environment to identify unpatched systems

How to Mitigate CVE-2026-31793

Immediate Actions Required

• Upgrade iccDEV to version 2.3.1.5 or later immediately
• Identify all applications and systems using the iccDEV library in your environment
• Restrict access to ICC profile import/processing functionality to trusted users where possible
• Implement input validation for ICC profile files before processing with iccDEV

Patch Information

The vulnerability has been fixed in iccDEV version 2.3.1.5. The patch addresses the invalid pointer read issue in the CIccCalculatorFunc::ApplySequence() function by implementing proper pointer validation before memory access operations.

Official Resources:

• GitHub Release v2.3.1.5
• GitHub Pull Request #652 containing the fix
• GitHub Security Advisory GHSA-vgr5-3xqx-vcqx

Workarounds

• If immediate patching is not possible, consider restricting ICC profile processing to trusted, pre-validated profile files only
• Implement application sandboxing for processes that handle ICC profile parsing to limit crash impact
• Deploy process monitoring to automatically restart affected services if denial of service occurs
• Consider temporarily disabling or isolating ICC profile processing functionality in critical systems until patching is complete

# Verify iccDEV version and update if vulnerable
# Check current version
iccDEV --version

# Update to patched version (example using package manager or source)
# From source:
git clone https://github.com/InternationalColorConsortium/iccDEV.git
cd iccDEV
git checkout v2.3.1.5
cmake -B build
cmake --build build
sudo cmake --install build