CVE-2026-34548 Overview
CVE-2026-34548 is an Integer Overflow / Numeric Truncation Error vulnerability in iccDEV, a set of libraries and tools for working with ICC color management profiles. Prior to version 2.3.1.6, there is an Undefined Behavior (UB) condition in the XML conversion tooling path (iccToXml) caused by an implicit conversion from a negative signed integer to icUInt32Number (unsigned 32-bit), which changes the value. This vulnerability can lead to application crashes and denial of service conditions.
Critical Impact
Improper integer conversion in iccDEV's XML conversion tooling can trigger undefined behavior, potentially causing application crashes, denial of service, or unpredictable program execution when processing maliciously crafted ICC profiles.
Affected Products
- iccDEV versions prior to 2.3.1.6
- iccToXml XML conversion utility
- Applications and workflows utilizing iccDEV libraries for ICC profile processing
Discovery Timeline
- 2026-03-31 - CVE-2026-34548 published to NVD
- 2026-04-01 - Last updated in NVD database
Technical Details for CVE-2026-34548
Vulnerability Analysis
This vulnerability stems from improper handling of signed-to-unsigned integer conversions within the iccToXml tooling path. When a negative signed integer is implicitly converted to icUInt32Number (an unsigned 32-bit integer type), the resulting value wraps around according to modular arithmetic rules, producing a drastically different and unexpected value. This constitutes undefined behavior according to C/C++ language specifications and can lead to unpredictable program states.
The vulnerability is classified under CWE-681 (Incorrect Conversion between Numeric Types), which describes flaws where numeric values are converted between types in ways that produce unexpected results. In this case, the conversion from signed to unsigned preserves the bit pattern but interprets it as an unsigned value, potentially causing logic errors, buffer overruns, or application crashes.
Root Cause
The root cause is the implicit type conversion between a signed integer type and icUInt32Number (unsigned 32-bit integer) in the XML conversion code path. When negative values are passed through this conversion, the sign bit is reinterpreted as part of the magnitude, resulting in very large positive values instead of the intended negative value. This violates the expected invariants of the code and can cause the application to enter an inconsistent state.
Attack Vector
The attack vector is local, requiring an attacker to supply a maliciously crafted ICC profile to the iccToXml tool or any application using the affected iccDEV library functions. The exploitation scenario involves:
- An attacker crafts an ICC color profile containing values that will trigger the signed-to-unsigned conversion with negative inputs
- The victim processes this malicious ICC profile using the iccToXml tool or affected library functions
- The implicit conversion causes undefined behavior, potentially resulting in application crashes, memory corruption, or denial of service
The vulnerability does not require user interaction beyond processing the malicious file, and no privileges are required to exploit it.
Detection Methods for CVE-2026-34548
Indicators of Compromise
- Unexpected crashes of applications using iccDEV libraries when processing ICC profiles
- Error logs indicating integer overflow or conversion errors in the iccToXml processing path
- Abnormal memory usage patterns when handling ICC color management profiles
Detection Strategies
- Monitor for crashes or exceptions in applications utilizing iccDEV libraries, particularly in the XML conversion functionality
- Implement input validation to detect potentially malicious ICC profiles before processing
- Deploy static analysis tools to identify unsafe integer conversions in codebases using iccDEV
Monitoring Recommendations
- Enable comprehensive logging for applications that process ICC profiles using iccDEV
- Set up alerts for repeated application crashes related to color profile processing
- Monitor file system activity for suspicious ICC profile files being introduced to processing pipelines
How to Mitigate CVE-2026-34548
Immediate Actions Required
- Upgrade iccDEV to version 2.3.1.6 or later immediately
- Audit applications using iccDEV libraries to ensure they are using the patched version
- Implement input validation for ICC profiles before processing with iccDEV tools
Patch Information
The vulnerability has been patched in iccDEV version 2.3.1.6. The fix addresses the improper integer conversion by implementing proper bounds checking and type-safe conversions. For detailed information about the fix, refer to the GitHub Pull Request #725 and the GitHub Security Advisory GHSA-prwp-9gv6-ccxv.
Workarounds
- Restrict access to the iccToXml tool and related iccDEV utilities to trusted users only
- Validate ICC profiles from untrusted sources before processing using third-party validation tools
- Implement sandboxing or process isolation for applications that process untrusted ICC profiles
# Upgrade iccDEV to patched version
# Example using git to obtain the patched version
git clone https://github.com/InternationalColorConsortium/iccDEV.git
cd iccDEV
git checkout v2.3.1.6
# Follow build instructions from repository documentation
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
