CVE-2026-34546: iccDEV TIFF Division by Zero Vulnerability

CVE-2026-34546 Overview

A division by zero vulnerability exists in iccDEV, a set of libraries and tools for working with ICC color management profiles. Prior to version 2.3.1.6, a crafted TIFF input can trigger Undefined Behavior (UB) due to division by zero in the TIFF handling code paths used by iccTiffDump. This vulnerability allows local attackers to cause a denial of service condition by providing malicious TIFF files to the affected component.

Critical Impact

Attackers can exploit this vulnerability to crash applications using iccDEV TIFF processing, causing denial of service conditions in image processing workflows.

Affected Products

• iccDEV versions prior to 2.3.1.6
• Applications using iccDEV libraries for TIFF color profile handling
• iccTiffDump utility and related TIFF processing components

Discovery Timeline

• 2026-03-31 - CVE CVE-2026-34546 published to NVD
• 2026-04-01 - Last updated in NVD database

Technical Details for CVE-2026-34546

Vulnerability Analysis

This vulnerability is classified as CWE-369 (Divide By Zero), a type of input validation flaw that occurs when a program attempts to divide a value by zero without proper validation. In the context of iccDEV, the TIFF handling code paths in iccTiffDump fail to properly validate input values extracted from TIFF file structures before using them as divisors in arithmetic operations.

When a specially crafted TIFF file is processed, the malicious input triggers the division by zero condition, resulting in Undefined Behavior. Depending on the platform and compiler, this can manifest as application crashes, unexpected termination, or other unpredictable behavior that disrupts normal application functionality.

Root Cause

The root cause of this vulnerability lies in insufficient input validation within the TIFF parsing routines. The code responsible for processing TIFF metadata and color profile information extracts numeric values from the file structure without verifying that these values are non-zero before performing division operations. This allows an attacker to craft a TIFF file with zero values in fields that are subsequently used as divisors.

Attack Vector

This vulnerability requires local access to exploit. An attacker must provide a maliciously crafted TIFF file to an application or utility using the vulnerable iccDEV library. The attack scenario involves:

1. Creating a specially crafted TIFF file with zero values in fields used for division operations
2. Providing the malicious file to iccTiffDump or any application using the iccDEV TIFF processing functionality
3. The vulnerable code path processes the file and attempts to divide by zero
4. The application experiences undefined behavior, typically resulting in a crash

The vulnerability does not require special privileges or user interaction beyond processing the malicious file. For detailed technical information about the vulnerability mechanism, refer to the GitHub Security Advisory GHSA-fxgq-wf5v-25pq and GitHub Issue #719.

Detection Methods for CVE-2026-34546

Indicators of Compromise

• Unexpected application crashes or termination when processing TIFF files
• Core dump files generated during TIFF image processing operations
• Error logs indicating arithmetic exceptions or SIGFPE signals
• Abnormal TIFF files with zero-value fields in critical metadata structures

Detection Strategies

• Implement file integrity monitoring for applications using iccDEV libraries to detect crash patterns
• Deploy application crash monitoring to identify repeated failures in TIFF processing workflows
• Use static analysis tools to identify division operations without zero-value checks in codebases using iccDEV
• Monitor system logs for arithmetic exception signals associated with image processing applications

Monitoring Recommendations

• Enable crash reporting for applications utilizing iccDEV TIFF handling functionality
• Monitor for unusual TIFF file submissions that may indicate exploitation attempts
• Track application stability metrics for image processing pipelines
• Implement file validation checks before processing TIFF files through vulnerable components

How to Mitigate CVE-2026-34546

Immediate Actions Required

• Upgrade iccDEV to version 2.3.1.6 or later immediately
• Audit applications and systems for iccDEV library usage
• Implement input validation for TIFF files before processing through iccDEV
• Consider temporary isolation of TIFF processing workflows until patching is complete

Patch Information

The vulnerability has been patched in iccDEV version 2.3.1.6. The fix addresses the division by zero issue by adding proper validation checks before arithmetic operations in the TIFF handling code paths. The patch is available through GitHub Pull Request #723. Users should update to the latest version to remediate this vulnerability.

Workarounds

• Implement pre-processing validation of TIFF files to reject files with invalid or suspicious metadata values
• Run TIFF processing in sandboxed or isolated environments to limit the impact of crashes
• Use application-level exception handling to gracefully manage crashes without service disruption
• Consider alternative TIFF processing libraries temporarily while patching is coordinated

# Configuration example - Verify iccDEV version
# Check current installed version
iccTiffDump --version

# Update to patched version 2.3.1.6 or later
# Follow your package manager or build instructions to update iccDEV
git clone https://github.com/InternationalColorConsortium/iccDEV.git
cd iccDEV
git checkout v2.3.1.6
# Follow standard build instructions for your platform