# CVE-2026-21334: Adobe Substance3D Designer out-of-bounds write

Source: https://junglewise.ai/threats/cve-2026-21334-adobe-substance3d-designer-out-of-bounds-write  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-02-10. Updated: 2026-09-25  
License: CC BY 4.0 with a link back

CVE-2026-21334 · Severity: high · CVSS 7.8 · Published 2026-02-10

Adobe Substance3D Designer is a 3D design tool used by professionals to create digital assets. Versions 15.1.0 and earlier contain an out-of-bounds memory write flaw that could allow arbitrary code execution when a user opens a specially crafted malicious file, potentially compromising the user's system and any projects or data accessible through the application.

Technologies: [Adobe Substance 3d Designer](https://junglewise.ai/threats/technologies/substance-3d-designer), [Adobe Substance3D Designer](https://junglewise.ai/threats/technologies/substance3d-designer). Vendors: [Adobe](https://junglewise.ai/threats/vendors/adobe).

## Quick answers

**Is CVE-2026-21334 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-21334 being exploited in the wild.

**How severe is CVE-2026-21334?** High severity, with a CVSS score of 7.8, published 10 February 2026.

**Which products and versions are affected?** Adobe Substance3D Designer 15.1.0 and earlier.

**Is there a fix for CVE-2026-21334?** No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.

**How is CVE-2026-21334 attacked?** It is attacked with local access.

**Am I affected by CVE-2026-21334?** Check whether you run Adobe Substance 3d Designer or Adobe Substance3D Designer at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

## Technical details

The vulnerability is a classic out-of-bounds write condition in Substance3D Designer version 15.1.0 and earlier, allowing an attacker to write data beyond allocated memory boundaries. The attack requires user interaction—specifically, the victim must be tricked into opening a malicious file (likely a specially crafted design or project file). Successful exploitation results in arbitrary code execution with the privileges of the current user, potentially enabling full system compromise. No patch availability status is indicated in the advisory; users should check Adobe's security bulletins for remediation guidance.

## Affected products

- Adobe Substance3D Designer 15.1.0 and earlier

## Timeline

- 2026-02-10: disclosed

## References

- [https://helpx.adobe.com/security/products/substance3d_designer/apsb26-19.html](https://helpx.adobe.com/security/products/substance3d_designer/apsb26-19.html)

## Related threats

- [Adobe Substance 3D Designer NULL pointer dereference denial-of-service](https://junglewise.ai/threats/cve-2026-103829-substance3d-designer-is-affected-by-a-null-pointer-dereference)
- [Adobe Substance 3D Designer null pointer dereference](https://junglewise.ai/threats/cve-2026-103828-substance3d-designer-is-affected-by-a-null-pointer-dereference)
- [Adobe Substance 3D Designer stack-based buffer overflow](https://junglewise.ai/threats/cve-2026-103827-substance3d-designer-is-affected-by-a-stack-based-buffer)
- [Adobe Substance 3D Designer null pointer dereference](https://junglewise.ai/threats/cve-2026-103826-substance3d-designer-is-affected-by-a-null-pointer-dereference)
- [Adobe Substance 3D Designer out-of-bounds read in file parsing](https://junglewise.ai/threats/cve-2026-103825-substance3d-designer-is-affected-by-an-out-of-bounds-read)