# CVE-2026-21303: Adobe Substance3D Modeler out-of-bounds read in file parsing

Source: https://junglewise.ai/threats/cve-2026-21303-adobe-substance3d-modeler-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-2026-21303 · Severity: medium · CVSS 5.5 · Published 2026-01-13

Substance3D Modeler is Adobe's professional 3D modeling and design tool used by creative professionals. A memory reading vulnerability in versions 1.22.4 and earlier allows an attacker to extract sensitive data from memory by tricking a user into opening a specially crafted file, potentially exposing passwords, keys, or other confidential information.

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

## Quick answers

**Is CVE-2026-21303 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-21303 being exploited in the wild.

**How severe is CVE-2026-21303?** Medium severity, with a CVSS score of 5.5, published 13 January 2026.

**Which products and versions are affected?** Adobe Substance3D Modeler 1.22.4 and earlier.

**Is there a fix for CVE-2026-21303?** 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-2026-21303 attacked?** It is attacked with local access.

**Am I affected by CVE-2026-21303?** Check whether you run Adobe Substance 3d Modeler or Adobe Substance3D Modeler 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 flaw in Substance3D Modeler's file parsing logic that occurs when processing malicious input files. An attacker can craft a specially formatted file that triggers an out-of-bounds memory access, allowing them to read adjacent memory contents and exfiltrate sensitive data. The attack requires user interaction—a victim must open the malicious file in the application. No patch information is currently available for versions 1.22.4 and earlier.

## Affected products

- Adobe Substance3D Modeler 1.22.4 and earlier

## Timeline

- 2026-01-13: disclosed

## References

- [https://helpx.adobe.com/security/products/substance3d-modeler/apsb26-08.html](https://helpx.adobe.com/security/products/substance3d-modeler/apsb26-08.html)

## Related threats

- [Adobe Substance3D Modeler out-of-bounds write](https://junglewise.ai/threats/cve-2026-83963-substance3d-modeler-is-affected-by-an-out-of-bounds-write)
- [Adobe Substance3D Modeler stack buffer overflow](https://junglewise.ai/threats/cve-2026-83962-substance3d-modeler-is-affected-by-a-stack-based-buffer-overflow)
- [Adobe Substance3D Modeler out-of-bounds write](https://junglewise.ai/threats/cve-2026-81998-substance3d-modeler-is-affected-by-an-out-of-bounds-write)
- [Adobe Substance3D Modeler out-of-bounds write](https://junglewise.ai/threats/cve-2026-79906-substance3d-modeler-is-affected-by-an-out-of-bounds-write)
- [Adobe Substance3D Modeler out-of-bounds read](https://junglewise.ai/threats/cve-2026-21348-adobe-substance3d-modeler-out-of-bounds-read)