# CVE-2026-21503: iccDEV has Undefined Behavior - Null Pointer Passed to memcpy() in CIccTagSparseMatrixArray

> A null pointer dereference in iccDEV can cause undefined behavior and denial of service when processing malformed ICC profiles.

- **Severity:** Medium 6.1 (`CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:H`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Local or same network only
- **Victim action needed:** A user has to click or open something
- **Fix available:** No
- **Published:** 7 Jan 2026
- **Updated:** 7 Jan 2026
- **Also known as:** GHSA-h554-qrfh-53gx

## What is CVE-2026-21503?

CVE-2026-21503 is a medium-severity vulnerability in Color Iccdev, published on 7 Jan 2026. It can only be exploited from the same machine or local network, and only if a user opens a file or follows a link.

### Official description

iccDEV provides a set of libraries and tools that allow for the interaction, manipulation, and application of ICC color management profiles. Prior to version 2.3.1.2, iccDEV has undefined behavior due to a null pointer passed to memcpy() in CIccTagSparseMatrixArray. This issue has been patched in version 2.3.1.2.

Weakness: CWE-628 (Function Call with Incorrectly Specified Arguments), CWE-476 (NULL Pointer Dereference), CWE-20 (Improper Input Validation), CWE-131 (Incorrect Calculation of Buffer Size)

## Which versions are affected by CVE-2026-21503?

It affects 1 product.


Products: Color Iccdev.

## How do I fix CVE-2026-21503?

No fix has been published for CVE-2026-21503 yet. Limit exposure of the affected software until one is available.

## Is CVE-2026-21503 being exploited?

There is no known exploitation of CVE-2026-21503 in the wild and no public exploit code.

## Other vulnerabilities in Color Iccdev

- [CVE-2026-21675](https://insights.sbomify.com/CVE-2026-21675/): iccDEV has a Use After Free vulnerability in CIccCmm class via improper hint manager object deletion (critical 9.8)
- [CVE-2026-24405](https://insights.sbomify.com/CVE-2026-24405/): iccDEV has Heap Buffer Overflow in CIccMpeCalculator::Read() (high 8.8)
- [CVE-2026-24406](https://insights.sbomify.com/CVE-2026-24406/): iccDEV has Heap Buffer Overflow in CIccTagNamedColor2::SetSize() (high 8.8)
- [CVE-2026-24412](https://insights.sbomify.com/CVE-2026-24412/): iccDEV has Heap Buffer Overflow in icCurvesFromXml() (high 8.8)
- [CVE-2026-22861](https://insights.sbomify.com/CVE-2026-22861/): iccDEV has a heap-buffer-overflow in SIccCalcOp::Describe() at IccProfLib/IccMpeCalc.cpp (high 8.8)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-21503 and fix it if it is affected.

What it is: CVE-2026-21503 is a medium-severity vulnerability in Color Iccdev, published on 7 Jan 2026. It can only be exploited from the same machine or local network, and only if a user opens a file or follows a link.
Exploitation: There is no known exploitation of CVE-2026-21503 in the wild and no public exploit code.

Affected product: Color Iccdev. No package-level version data is available, so check the vendor advisory linked from the reference page.

Task:
1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.
2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.
3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.
4. Run the tests and summarise what changed and why.
5. If nothing in the project is affected, say so and change nothing.

Reference: https://insights.sbomify.com/CVE-2026-21503/ (Markdown: https://insights.sbomify.com/CVE-2026-21503/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-21503
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-21503
- OSV: https://osv.dev/vulnerability/CVE-2026-21503

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-21503/
Summaries are generated and may contain mistakes; the official description above is the record.