CVE-2026-24852: iccDEV Buffer Overflow Vulnerability

CVE-2026-24852 Overview

CVE-2026-24852 is a heap buffer over-read vulnerability affecting the iccDEV library, which provides tools for interaction, manipulation, and application of ICC color management profiles. The vulnerability occurs when the strlen() function attempts to read a non-null-terminated buffer, potentially leaking heap memory contents and causing application termination.

Critical Impact

This vulnerability can lead to information disclosure through heap memory leakage and denial of service through application crashes when processing maliciously crafted ICC color profiles.

Affected Products

• iccDEV library versions prior to 2.3.1.2
• Applications that process ICC color profiles using the vulnerable iccDEV library
• Systems processing user-supplied ICC profile data

Discovery Timeline

• 2026-01-28 - CVE CVE-2026-24852 published to NVD
• 2026-01-29 - Last updated in NVD database

Technical Details for CVE-2026-24852

Vulnerability Analysis

This vulnerability is classified as CWE-122 (Heap-based Buffer Overflow). The core issue lies in the icXmlParseTextString() function, which fails to properly validate UTF-8 string boundaries before processing. When a malformed or maliciously crafted ICC profile contains a non-null-terminated string buffer, the strlen() function reads beyond the allocated buffer boundaries, accessing adjacent heap memory.

ICC Profile Injection vulnerabilities arise when user-controllable input is incorporated into ICC profile data or other structured binary blobs in an unsafe manner. The local attack vector requires user interaction, such as opening a malicious image file containing a crafted ICC profile.

Root Cause

The root cause is improper bounds checking when processing UTF-8 encoded text strings within ICC profile data. The original code assumed that input buffers would always be properly null-terminated, leading to unsafe memory access when this assumption was violated. The vulnerable code path in IccProfLib/IccConvertUTF.cpp lacked proper length validation before string operations.

Attack Vector

An attacker can exploit this vulnerability by crafting a malicious ICC color profile with a non-null-terminated text field. When a victim opens a file (such as an image) containing this malicious profile using an application that relies on the vulnerable iccDEV library, the heap buffer over-read is triggered. This can result in:

1. Information Disclosure: Sensitive data from adjacent heap memory may be leaked
2. Denial of Service: The application may crash due to accessing invalid memory regions

The security patch introduces a new function isLegalUTF8String() that properly validates the entire UTF-8 string with explicit length bounds:

/* --------------------------------------------------------------------- */

Boolean isLegalUTF8String (const UTF8* sourceStart, int length )
{
  const UTF8 *source = sourceStart;
  const UTF8 *sourceEnd = sourceStart + length;
  
  while (source < sourceEnd) {
    UTF32 ch = 0;
    unsigned short extraBytesToRead = trailingBytesForUTF8[*source];
    if (source + extraBytesToRead >= sourceEnd) {
      // result = sourceExhausted;
      return false;
    }
    /* Do this check whether lenient or strict */
    if (! isLegalUTF8(source, extraBytesToRead+1)) {
        // result = sourceIllegal;
        return false;
    }

    /*
    * The cases all fall through. See "Note A" below.
    */
    switch (extraBytesToRead) {
      case 5: ch += *source++; ch <<= 6; [[fallthrough]]; /* remember, illegal UTF-8 */
      case 4: ch += *source++; ch <<= 6; [[fallthrough]]; /* remember, illegal UTF-8 */

Source: GitHub Commit

Detection Methods for CVE-2026-24852

Indicators of Compromise

• Unexpected application crashes when processing image files or documents containing ICC color profiles
• Memory access violations or segmentation faults in applications using the iccDEV library
• Anomalous heap memory patterns indicating potential information leakage during ICC profile processing

Detection Strategies

• Monitor for crashes in applications that process ICC color profiles, particularly with stack traces pointing to icXmlParseTextString() or UTF-8 conversion functions
• Deploy application security monitoring to detect out-of-bounds memory access patterns
• Implement file integrity monitoring for ICC profile libraries and verify version numbers against 2.3.1.2 or later
• Use AddressSanitizer (ASAN) or similar memory debugging tools during development and testing to detect heap buffer over-reads

Monitoring Recommendations

• Enable crash reporting and analysis for applications processing user-supplied ICC profiles
• Implement logging for ICC profile parsing operations to identify suspicious or malformed profiles
• Monitor system event logs for repeated application failures associated with color profile processing
• Consider network-level monitoring for files containing ICC profile data being transferred to critical systems

How to Mitigate CVE-2026-24852

Immediate Actions Required

• Upgrade iccDEV library to version 2.3.1.2 or later immediately
• Identify all applications in your environment that use the iccDEV library for ICC profile processing
• Restrict processing of ICC profiles from untrusted sources until patching is complete
• Review and audit any custom code that interacts with ICC profile text parsing functions

Patch Information

The vulnerability has been fixed in iccDEV version 2.3.1.2. The patch introduces proper bounds checking for UTF-8 string validation through a new isLegalUTF8String() function that explicitly validates string length before processing.

For detailed patch information, refer to:

• GitHub Security Advisory
• GitHub Pull Request #540
• GitHub Commit 3092499cd4d0775f4a716b999899f9c26f9bc614

Workarounds

• No official workarounds are available according to the vendor advisory
• As a temporary measure, consider restricting or sandboxing applications that process ICC profiles from untrusted sources
• Implement input validation to reject ICC profiles that exceed expected size limits or contain suspicious characteristics
• Consider using application-level sandboxing to limit the impact of potential memory disclosure

# Verify iccDEV library version
# Check if installed version is vulnerable (prior to 2.3.1.2)
pkg-config --modversion iccDEV 2>/dev/null || echo "Package not found via pkg-config"

# For systems using the library from source, check the git tag
cd /path/to/iccDEV && git describe --tags