CVE-2026-50278: iccDEV Buffer Overflow Vulnerability

CVE-2026-50278 Overview

CVE-2026-50278 is a size_t integer underflow vulnerability in iccDEV, a library and toolset for working with International Color Consortium (ICC) color management profiles. The flaw resides in the CIccEmbedIO::Read8() function and triggers when parsing crafted ICC profiles containing icSigEmbeddedV5ProfileTag data with icSigEmbeddedProfileType payloads. Versions prior to 2.3.2.1 are affected. The vulnerability is classified as an out-of-bounds read [CWE-125] and requires user interaction to open a malicious profile.

Critical Impact
Attackers can craft malicious ICC color profiles that cause a size_t underflow when parsed by iccDEV, leading to out-of-bounds memory access and application denial of service.

Affected Products

iccDEV versions prior to 2.3.2.1
Applications embedding the iccDEV CIccEmbedIO parser
Downstream tools consuming the IccLibConnect and IccLibJSON components

Discovery Timeline

2026-08-21 - CVE-2026-50278 published to the National Vulnerability Database
2026-08-26 - Last updated in NVD database

Technical Details for CVE-2026-50278

Vulnerability Analysis

The vulnerability originates in the embedded-profile read routine of iccDEV. When the parser processes an ICC profile that embeds a icSigEmbeddedV5ProfileTag tag containing an icSigEmbeddedProfileType payload, size computations in CIccEmbedIO::Read8() can underflow the unsigned size_t type. The underflow yields an enormous size value that drives subsequent read operations past valid buffer bounds, producing an out-of-bounds read condition.

Because ICC profiles are embedded in many common file formats such as PNG, JPEG, TIFF, and PDF, an attacker can deliver a malicious profile through any application that renders or converts such files with iccDEV. Successful exploitation results in a crash of the parsing process and denial of service to the host application.

Root Cause

The root cause is a boundary check defect during embedded-profile length calculation. The code subtracts a header or offset value from a payload length without validating that the payload length exceeds the subtracted value. When the subtrahend is larger than the minuend, the unsigned arithmetic wraps around, and the resulting size_t value is used directly as a read length.

Attack Vector

Exploitation is network-reachable but requires user interaction: a victim must open or process a crafted ICC profile with a vulnerable iccDEV-linked application. No privileges are required. The attacker delivers the malicious profile embedded in an image or document, or as a standalone .icc file.

cpp

// Patch excerpt from IccConnect/IccLibConnect/IccCmmConfig.cpp
       if (c < 0) {
         if (str.size() != size_t(0))
           line.push_back(str);
-        if (!line.size())
+        if (line.size() == size_t(0))
           return false;
         break;
       }
// Source: https://github.com/InternationalColorConsortium/iccDEV/commit/002d1108c1bd674de0ac1b0abfa0162986f19086

The patch also hardens allocation error handling in the JSON I/O layer:

cpp

// Patch excerpt from IccJSON/IccLibJSON/IccIoJson.cpp
 #include "IccIoJson.h"
+#include <new>

 CIccIO *CIccJsonStandardFileIO::OpenFile(const icChar *szFilename, const char *szAttr)
 {
-  CIccFileIO *file = new CIccFileIO();
-  if (!file->Open(szFilename, szAttr)) {
+  CIccFileIO *file = new (std::nothrow) CIccFileIO();
+  if (file && !file->Open(szFilename, szAttr)) {
     delete file;
     return nullptr;
   }
// Source: https://github.com/InternationalColorConsortium/iccDEV/commit/002d1108c1bd674de0ac1b0abfa0162986f19086

Detection Methods for CVE-2026-50278

Indicators of Compromise

Unexpected crashes or segmentation faults in processes that parse ICC color profiles, such as image viewers, print pipelines, or PDF renderers.
Presence of ICC profiles containing malformed icSigEmbeddedV5ProfileTag structures with inconsistent length fields.
Files with .icc or .icm extensions received from untrusted sources or embedded in inbound image and document workflows.

Detection Strategies

Inventory endpoints and build systems for applications statically or dynamically linked against iccDEV, and compare against version 2.3.2.1.
Deploy YARA or content-inspection rules that flag ICC profiles with icSigEmbeddedProfileType payloads whose declared length is inconsistent with the containing tag size.
Correlate process-crash telemetry with recently opened image, PDF, or ICC files to surface exploitation attempts.

Monitoring Recommendations

Log and alert on repeated unexpected terminations of color-management or rendering processes.
Monitor file gateways and email attachments for standalone ICC profile files and quarantine those from untrusted senders.
Track dependency manifests in CI/CD to detect vulnerable iccDEV versions entering builds.

How to Mitigate CVE-2026-50278

Immediate Actions Required

Upgrade iccDEV to version 2.3.2.1 or later across all applications, build systems, and container images.
Rebuild and redeploy any downstream products that statically link iccDEV to include the patched code.
Restrict ingestion of untrusted ICC profiles and embedded profile payloads until patched builds are in production.

Patch Information

The fix is delivered in iccDEV 2.3.2.1 and tracked in GitHub Security Advisory GHSA-7qjg-7qq4-c77j. The upstream code changes are consolidated in the GitHub Commit Update, with additional context in GitHub Issue #987.

Workarounds

No official workarounds are available from the maintainers; upgrading to 2.3.2.1 is required.
As a temporary compensating control, disable or sandbox parsers that accept externally supplied ICC profiles.
Enforce content filtering to strip embedded ICC profiles from inbound images and documents where color fidelity is not required.

bash

# Verify installed iccDEV version and update to the patched release
git clone https://github.com/InternationalColorConsortium/iccDEV.git
cd iccDEV
git checkout v2.3.2.1
cmake -S . -B build && cmake --build build --config Release