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The vulnerability, identified as CVE-2026-31796, resides in the `icCurvesFromXml()` function within iccDEV versions prior to 2.3.1.5. This function is responsible for parsing XML-based curve data used in ICC color profiles. The flaw is a classic heap-based buffer overflow, which occurs when the function writes more data into a buffer allocated on the heap than it can hold. Specifically, when processing a specially crafted ICC profile or an XML file defining color curves, the program fails to properly validate the size of the input against the allocated buffer. An attacker can exploit this by providing a malicious file that triggers an out-of-bounds write on the heap. This memory corruption can lead to a denial of service through application crashes or, under the right conditions, potentially allow for arbitrary code execution by overwriting adjacent heap metadata or function pointers . The issue is fixed by implementing proper bounds checking in version 2.3.1.5, ensuring that data written to the heap buffer does not exceed its allocated size.
Platform: iccDEV
Version: < 2.3.1.5
Vulnerability: Heap-based overflow
Severity: Medium
Date: March 10, 2026
Prediction: Already patched (2.3.1.5)
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Analysis
The vulnerability is a memory corruption issue in a core parsing function (icCurvesFromXml) of the iccDEV library. Successful exploitation requires user interaction (e.g., opening a malicious ICC profile). The CVSS 3.1 base score is 5.5 (Medium), with a vector of AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H, indicating a local attack vector, low complexity, no privileges required, but user interaction is necessary, and the primary impact is on availability (high) . This is a typical “parser bug” where unsanitized input length leads to a heap buffer overflow .
Bash/Commands
Check the current version of iccDEV installed (if any) pkg-config --modversion iccdev If vulnerable ( < 2.3.1.5 ), update to the patched version using a package manager or from source. Example for Debian/Ubuntu (if package is available) sudo apt update sudo apt install iccdev Example using wget to fetch the latest source (adjust URL as needed) wget https://github.com/InternationalColorConsortium/iccDEV/archive/refs/tags/v2.3.1.5.tar.gz tar -xzf v2.3.1.5.tar.gz cd iccDEV-2.3.1.5 mkdir build && cd build cmake .. make sudo make install To test if a file triggers the vulnerability, one could use a fuzzer like AFL++. This is a conceptual command, not a direct exploit. afl-fuzz -i input_corpus/ -o findings/ ./icclib_parser @@
Exploit
As of the publication date, there is no public proof-of-concept (PoC) exploit available. However, the vulnerability is technically exploitable. An attacker would need to craft a malicious ICC profile or an XML file with an overly long curve definition. When parsed by a vulnerable application using the iccDEV library, this file would trigger the heap overflow in icCurvesFromXml(). In a best-case scenario for the attacker, this could lead to remote code execution; in the worst case, it results in a denial-of-service crash.
Protection
- Update: Immediately update the `iccDEV` library to version 2.3.1.5 or later, which contains the fix for this vulnerability.
- Input Validation: Applications using iccDEV should implement additional validation on ICC profile sources, avoiding the parsing of untrusted or unsolicited profile data.
- Sandboxing: Run applications that process ICC profiles (especially from untrusted sources) in a restricted environment or sandbox to limit the impact of a potential compromise.
- Security Monitoring: Monitor systems for crashes in applications that utilize iccDEV, as repeated crashes may indicate exploitation attempts.
Impact
The primary impact of CVE-2026-31796 is on system availability due to application crashes caused by memory corruption. However, heap-based buffer overflows are frequently leveraged to achieve remote code execution (RCE). If successfully exploited for RCE, an attacker could gain the same privileges as the application processing the malicious file, potentially leading to data theft, further system compromise, or use as a pivot point within a network .
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Reported By: nvd.nist.gov
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