CVE-2026-34536: iccDEV Buffer Overflow Vulnerability

CVE-2026-34536 Overview

A stack overflow vulnerability exists in iccDEV, a library and toolset for working with ICC color management profiles. Prior to version 2.3.1.6, a specially crafted ICC profile can trigger a stack overflow in the SIccCalcOp::ArgsUsed() function. The vulnerability manifests when iccApplyProfiles processes a malicious profile, with the crash occurring during argument usage computation as part of calculator underflow/overflow checks.

Critical Impact

Processing a malicious ICC color profile can cause denial of service through stack exhaustion, potentially crashing applications that rely on iccDEV for color management functionality.

Affected Products

• iccDEV versions prior to 2.3.1.6
• Applications using iccDEV libraries for ICC profile processing
• Systems processing untrusted ICC color management profiles

Discovery Timeline

• 2026-03-31 - CVE-2026-34536 published to NVD
• 2026-04-01 - Last updated in NVD database

Technical Details for CVE-2026-34536

Vulnerability Analysis

This vulnerability is classified as CWE-674 (Uncontrolled Recursion), where the SIccCalcOp::ArgsUsed() function can be manipulated through crafted input to exceed the available stack space. When iccDEV processes a malicious ICC profile, the calculator component performs underflow/overflow checks that involve computing argument usage. A specially crafted profile can cause this computation to recurse or iterate excessively, exhausting the call stack.

The issue was identified through AddressSanitizer (ASan) instrumentation, which detected the stack-overflow condition during profile processing. This indicates the vulnerability involves unbounded stack growth, likely through deep recursion or excessive stack allocation during the argument usage calculation.

Root Cause

The root cause lies in insufficient bounds checking within the SIccCalcOp::ArgsUsed() function when processing ICC profile calculator operations. The function fails to properly limit stack consumption when evaluating argument usage for calculator operations, allowing malicious profiles to trigger uncontrolled stack growth during underflow/overflow validation checks.

Attack Vector

The attack vector requires local access to provide a malicious ICC profile to an application using iccDEV. An attacker would craft a specially constructed ICC profile designed to exploit the stack overflow condition in SIccCalcOp::ArgsUsed(). When the iccApplyProfiles tool or any application using the iccDEV library processes this profile, the stack overflow is triggered, resulting in a denial of service condition.

The vulnerability can be triggered by:

1. Providing a malicious ICC profile to command-line tools like iccApplyProfiles
2. Uploading crafted ICC profiles to applications that process color management data
3. Including malicious profiles in documents or images that embed ICC color data

Detection Methods for CVE-2026-34536

Indicators of Compromise

• Unexpected crashes in applications using iccDEV libraries with stack overflow errors
• Process termination with segmentation faults during ICC profile processing
• AddressSanitizer reports showing stack-buffer-overflow in SIccCalcOp::ArgsUsed()
• Abnormal memory consumption patterns prior to application crashes

Detection Strategies

• Monitor application crash logs for stack overflow indicators related to ICC profile processing
• Implement file integrity monitoring for ICC profile directories
• Use memory analysis tools like AddressSanitizer to detect exploitation attempts
• Deploy endpoint detection solutions to identify anomalous ICC profile processing behavior

Monitoring Recommendations

• Enable crash reporting for applications that process ICC profiles
• Monitor system logs for repeated crashes in color management components
• Track file access patterns for ICC profile directories to identify suspicious activity
• Implement alerting for applications experiencing unexpected termination during color processing operations

How to Mitigate CVE-2026-34536

Immediate Actions Required

• Upgrade iccDEV to version 2.3.1.6 or later immediately
• Restrict processing of ICC profiles from untrusted sources
• Implement input validation to reject abnormally structured ICC profiles
• Consider sandboxing applications that process untrusted color management data

Patch Information

The vulnerability has been patched in iccDEV version 2.3.1.6. The fix addresses the stack overflow condition in SIccCalcOp::ArgsUsed() by implementing proper bounds checking during argument usage computation. Users should upgrade to the patched version as soon as possible. For more details, see the GitHub Security Advisory GHSA-cr68-xp9x-8597 and the related pull request #684.

Workarounds

• Avoid processing ICC profiles from untrusted or unknown sources until patched
• Implement stack size limits for processes handling ICC profiles
• Use containerization or sandboxing to isolate ICC profile processing
• Consider using alternative color management libraries until upgrade is complete

# Configuration example
# Verify iccDEV version after upgrade
iccApplyProfiles --version
# Expected output should show version 2.3.1.6 or higher

# Set stack size limits as a temporary mitigation (Linux)
ulimit -s 8192