CVE-2026-34547: iccDEV Buffer Overflow Vulnerability

CVE-2026-34547 Overview

CVE-2026-34547 is an Undefined Behavior (UB) vulnerability affecting iccDEV, a library and toolset for working with ICC color management profiles. The vulnerability exists in IccUtil.cpp and can be triggered when processing a specially crafted ICC profile using the iccDumpProfile utility. This flaw allows attackers to cause a denial of service condition through malformed input files.

Critical Impact

A crafted ICC profile can trigger undefined behavior in IccUtil.cpp, potentially causing application crashes or unpredictable system behavior when processing malicious color profiles.

Affected Products

• iccDEV versions prior to 2.3.1.6
• Applications and systems utilizing iccDEV libraries for ICC profile processing
• Workflows that process untrusted ICC color profiles using iccDumpProfile

Discovery Timeline

• 2026-03-31 - CVE-2026-34547 published to NVD
• 2026-04-01 - Last updated in NVD database

Technical Details for CVE-2026-34547

Vulnerability Analysis

This vulnerability is classified under CWE-758 (Reliance on Undefined, Unspecified, or Implementation-Defined Behavior). The flaw occurs within the IccUtil.cpp source file when the iccDEV library processes ICC color management profiles. When a specially crafted ICC profile is passed to the iccDumpProfile utility, it triggers an undefined behavior condition that can lead to denial of service.

The vulnerability requires local access to exploit, meaning an attacker must either have local system access or convince a user to process a malicious ICC profile. The attack does not require any privileges and no user interaction is needed once the malformed profile is processed by the vulnerable utility.

Root Cause

The root cause of this vulnerability stems from the code in IccUtil.cpp relying on undefined behavior when handling certain edge cases in ICC profile data structures. When parsing profile data, the code fails to properly validate or handle specific malformed input conditions, resulting in undefined program behavior according to the C/C++ language specifications. This can manifest as crashes, memory corruption, or other unpredictable outcomes depending on the compiler and runtime environment.

Attack Vector

The attack vector is local, requiring an attacker to deliver a malicious ICC profile to a system running vulnerable versions of iccDEV. Attack scenarios include:

The vulnerability is triggered through the iccDumpProfile command-line utility when it attempts to process a crafted ICC profile. An attacker could deliver malicious profiles through file sharing, email attachments, or by compromising repositories of ICC profiles. When a user or automated system processes the malformed profile, the undefined behavior condition is triggered, potentially causing application crashes and denial of service.

For technical details on the specific undefined behavior condition, refer to the GitHub Issue #720 and the GitHub Security Advisory GHSA-v8h6-8hxj-j7ff.

Detection Methods for CVE-2026-34547

Indicators of Compromise

• Unexpected crashes of iccDumpProfile or applications using iccDEV libraries
• Core dumps or crash logs indicating failures in IccUtil.cpp functions
• Presence of unusual or malformed ICC profile files (.icc, .icm) on the system
• Application error logs showing undefined behavior or memory access violations during ICC profile processing

Detection Strategies

• Monitor for crashes in processes that use iccDEV libraries, particularly iccDumpProfile
• Implement file integrity monitoring for directories containing ICC profiles
• Use static analysis tools to identify iccDEV library versions in deployed applications
• Deploy endpoint detection and response (EDR) solutions to identify anomalous process behavior

Monitoring Recommendations

• Enable crash reporting and logging for applications utilizing iccDEV
• Monitor system logs for segmentation faults or undefined behavior exceptions in color management workflows
• Establish baseline behavior for ICC profile processing utilities to detect anomalies
• Review incoming ICC profiles from untrusted sources before processing

How to Mitigate CVE-2026-34547

Immediate Actions Required

• Upgrade iccDEV to version 2.3.1.6 or later immediately
• Audit systems for vulnerable versions of iccDEV libraries
• Restrict processing of ICC profiles from untrusted sources until patched
• Implement input validation for ICC profile files before processing

Patch Information

The vulnerability has been patched in iccDEV version 2.3.1.6. The fix addresses the undefined behavior condition in IccUtil.cpp. Organizations should update to the patched version as soon as possible.

For detailed patch information, review the GitHub Pull Request #724 which contains the security fix.

Workarounds

• Avoid processing ICC profiles from untrusted or unknown sources until the patch is applied
• Implement sandboxing for iccDumpProfile and related utilities to limit the impact of crashes
• Use file type validation to reject ICC profiles that fail basic structural checks
• Consider running ICC profile processing in isolated environments with limited system access

# Verify iccDEV version to ensure patch is applied
iccDumpProfile -v 2>&1 | grep -i version
# Expected output should show version 2.3.1.6 or later

# Restrict ICC profile processing to trusted directories
chmod 750 /path/to/icc/profiles
chown root:trusted-users /path/to/icc/profiles