# CVE-2026-21308: Adobe Substance3D Designer out-of-bounds read in file parsing

Source: https://junglewise.ai/threats/cve-2026-21308-adobe-substance3d-designer-out-of-bounds-read-in-file-parsing  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-01-13. Updated: 2026-09-25  
License: CC BY 4.0 with a link back

CVE-2026-21308 · Severity: medium · CVSS 5.5 · Published 2026-01-13

Substance3D Designer is Adobe's 3D design and texturing application used by artists and designers. Versions 15.0.3 and earlier contain a memory read vulnerability that could expose sensitive data when a user opens a malicious design file. While exploitation requires user interaction, the flaw could lead to disclosure of confidential project data or system information.

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-2026-21308 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-21308 being exploited in the wild.

**How severe is CVE-2026-21308?** Medium severity, with a CVSS score of 5.5, published 13 January 2026.

**Which products and versions are affected?** Adobe Substance3D Designer 15.0.3 and earlier.

**Is there a fix for CVE-2026-21308?** 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-2026-21308 attacked?** It is attacked with local access.

**Am I affected by CVE-2026-21308?** 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 an out-of-bounds read in Substance3D Designer's file parsing logic, affecting versions 15.0.3 and earlier. An attacker can craft a malicious design file that triggers the out-of-bounds read when opened by a victim, allowing memory disclosure. The attack requires user interaction (opening the malicious file) and local execution context; the vulnerability does not provide remote code execution or privilege escalation. Adobe has patched this issue in versions later than 15.0.3.

## Affected products

- Adobe Substance3D Designer 15.0.3 and earlier

## Timeline

- 2026-01-13: disclosed

## References

- [https://helpx.adobe.com/security/products/substance3d_designer/apsb26-13.html](https://helpx.adobe.com/security/products/substance3d_designer/apsb26-13.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)