CVE-2026-50278 in iccDEV
Summary
by MITRE • 08/21/2026
iccDEV provides a set of libraries and tools for working with ICC color management profiles. Versions prior to 2.3.2.1 have a `CIccEmbedIO::Read8()` size_t underflow. The issue arises due to an embedded-profile read defect when parsing ICC profiles containing `icSigEmbeddedV5ProfileTag` data with `icSigEmbeddedProfileType` payloads. Version 2.3.2.1 patches the issue. No known workarounds are available.
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Analysis
by VulDB Data Team • 08/21/2026
The iccDEV library, a widely utilized toolkit for handling International Color Consortium color management profiles, contains a critical memory safety vulnerability in versions prior to 2.3.2.1 that stems from improper bounds checking during the parsing of embedded profile data. This flaw specifically manifests within the CIccEmbedIO::Read8() function when processing ICC profiles that contain icSigEmbeddedV5ProfileTag structures with icSigEmbeddedProfileType payloads. The core technical defect is a size_t underflow, which occurs because the library fails to adequately validate the length or offset parameters before performing arithmetic operations on buffer indices. In C and C++ environments, unsigned integer types such as size_t wrap around when subtracted below zero, leading to massive positive values that are subsequently used for memory access. This behavior transforms what might appear as a simple logic error into a severe exploitation vector capable of causing out-of-bounds reads or writes depending on the surrounding context and heap layout.
From an architectural perspective, this vulnerability aligns with CWE-190 Integer Overflow or Wraparound, specifically manifesting through underflow conditions that result in invalid memory access patterns. The attacker can craft a malicious ICC profile where specific tag data triggers the erroneous calculation within Read8(), causing the application to read from or write to arbitrary memory locations outside the intended buffer boundaries. This type of flaw is particularly dangerous because color management libraries are often integrated into high-level applications such as image editors, operating system display managers, and printing subsystems. These applications frequently process user-supplied images that may contain embedded ICC profiles for accurate color reproduction across different devices. Consequently, an attacker could distribute a maliciously crafted image file containing the malformed profile, tricking a victim into opening it with vulnerable software.
The operational impact of this vulnerability is significant due to its potential for remote code execution and denial of service. If the underflow leads to an out-of-bounds read, sensitive information from adjacent memory regions could be leaked, potentially exposing cryptographic keys or other confidential data stored in the process heap. More critically, if the flawed index is used as a destination for subsequent write operations, it enables arbitrary memory writes. This capability allows attackers to overwrite function pointers, return addresses, or critical control structures within the application's memory space. Such exploitation techniques are consistent with ATT&CK technique T1203 Exploitation for Client Execution, where malicious files are delivered and executed upon user interaction. The lack of known workarounds means that organizations relying on these older versions must prioritize immediate patching rather than attempting to mitigate the issue through configuration changes or input filtering at the application level without modifying the library source code.
Mitigation strategies focus primarily on upgrading the iccDEV library to version 2.3.2.1 or later, where the developers have implemented proper validation checks to prevent the integer underflow condition. For environments that cannot immediately update due to dependency constraints, implementing strict input sanitization at the application layer is recommended as a temporary defense-in-depth measure. This involves validating all ICC profile structures before passing them to the library's parsing functions, ensuring that tag lengths and offsets are within expected bounds relative to the total file size. Additionally, enabling compiler-based security features such as stack canaries, Address Sanitizer during testing phases, and Data Execution Prevention in production environments can help detect or prevent exploitation attempts arising from memory corruption vulnerabilities like this one. Regular auditing of third-party dependencies for known CVEs is essential to maintain a secure software supply chain against similar integer arithmetic flaws.