CVE-2026-27692: Color Iccdev Buffer Overflow Vulnerability

CVE-2026-27692 Overview

CVE-2026-27692 is a heap-buffer-overflow read vulnerability affecting iccDEV, a set of libraries and tools for working with ICC color management profiles. In versions up to and including 2.3.1.4, a heap-buffer-overflow read occurs during CIccTagTextDescription::Release() when strlen() reads past a heap buffer while parsing ICC profile XML text description tags, causing a crash.

Critical Impact

This vulnerability allows attackers to trigger denial of service conditions and potentially leak sensitive heap memory contents through crafted ICC profile files, impacting applications that process color management data.

Affected Products

• Color iccDEV versions up to and including 2.3.1.4
• Applications utilizing iccDEV libraries for ICC profile processing
• Systems processing ICC profile XML text description tags

Discovery Timeline

• 2026-02-25 - CVE CVE-2026-27692 published to NVD
• 2026-02-26 - Last updated in NVD database

Technical Details for CVE-2026-27692

Vulnerability Analysis

This heap-buffer-overflow vulnerability stems from improper memory allocation in the CIccTagTextDescription class. When processing ICC profile XML text description tags, the GetBuffer() function fails to properly account for null termination in its buffer size calculations. The off-by-one error in the size comparison (m_nASCIISize < nSize instead of m_nASCIISize < (nSize+1)) results in a buffer that is one byte too small to accommodate the null terminator.

Subsequently, when CIccTagTextDescription::Release() is called, the strlen() function reads past the allocated heap buffer boundaries searching for a null terminator that may not exist within the buffer. This out-of-bounds read can result in application crashes, memory disclosure, or undefined behavior depending on heap memory layout.

Root Cause

The root cause is an off-by-one error in buffer size calculation within the GetBuffer() function of IccProfLib/IccTagBasic.cpp. The original code compared m_nASCIISize < nSize and stored nSize as the buffer size, failing to account for the additional byte required for null termination. This classifies as both CWE-125 (Out-of-bounds Read) and CWE-787 (Out-of-bounds Write).

Attack Vector

The vulnerability requires local access with user interaction, as an attacker must convince a user to open a maliciously crafted ICC profile file. When the application parses the ICC profile XML text description tags, the undersized buffer allocation occurs. During cleanup operations or when accessing the text data, strlen() reads beyond the buffer boundary, causing heap corruption detection, crashes, or potential information disclosure from adjacent heap memory.

// Security patch from IccProfLib/IccTagBasic.cpp
// Source: https://github.com/InternationalColorConsortium/iccDEV/commit/29d088840b962a7cdd35993dfabc2cb35a049847

  */
 icChar *CIccTagTextDescription::GetBuffer(icUInt32Number nSize)
 {
-  if (m_nASCIISize < nSize) {
-    m_szText = (icChar*)icRealloc(m_szText, nSize+1);
+  if (m_nASCIISize < (nSize+1)) {
+    m_szText = (icChar*)icRealloc(m_szText, (nSize+1));
 
     m_szText[nSize] = '\0';
 
-    m_nASCIISize = nSize;
+    m_nASCIISize = (nSize+1); // include NULL termination!
   }
 
   return m_szText;

The fix correctly accounts for the null terminator by comparing against (nSize+1) and storing the true buffer size including the null byte, preventing the heap buffer overflow.

Detection Methods for CVE-2026-27692

Indicators of Compromise

• Application crashes when processing ICC profile files with long text description tags
• Memory corruption errors or heap overflow detections in applications using iccDEV libraries
• Unexpected termination of color management or image processing applications

Detection Strategies

• Monitor for application crashes associated with CIccTagTextDescription::Release() stack traces
• Implement AddressSanitizer (ASan) or similar memory safety tools during development and testing
• Deploy application crash monitoring to identify heap overflow patterns in ICC profile processing
• Use fuzzing tools to test ICC profile parsing with malformed text description tags

Monitoring Recommendations

• Enable heap overflow detection mechanisms in production environments where possible
• Log all ICC profile processing operations, particularly for externally-sourced files
• Monitor system stability metrics for applications that process color management profiles
• Implement file integrity monitoring for ICC profiles in critical workflows

How to Mitigate CVE-2026-27692

Immediate Actions Required

• Update iccDEV to a version containing commit 29d088840b962a7cdd35993dfabc2cb35a049847
• Review applications that depend on iccDEV libraries and schedule updates
• Implement input validation for ICC profile files from untrusted sources
• Consider temporary sandboxing of ICC profile processing operations

Patch Information

The vulnerability has been fixed in commit 29d088840b962a7cdd35993dfabc2cb35a049847. Organizations should update to the latest version of iccDEV that includes this fix. The patch is available through GitHub Pull Request 610 and the GitHub Commit. Additional details are available in the GitHub Security Advisory GHSA-3869.

Workarounds

• No official workarounds are available according to the vendor advisory
• Restrict processing of ICC profiles to trusted sources only
• Implement additional input validation and file scanning before processing external ICC profiles
• Run ICC profile processing in isolated environments or sandboxes to limit crash impact

# Configuration example
# Update iccDEV to latest patched version
git clone https://github.com/InternationalColorConsortium/iccDEV.git
cd iccDEV
git checkout 29d088840b962a7cdd35993dfabc2cb35a049847
# Follow build instructions to compile updated libraries