# CVE-2026-21345: Adobe Substance3D Stager out-of-bounds read in file parsing

Source: https://junglewise.ai/threats/cve-2026-21345-adobe-substance3d-stager-out-of-bounds-read-in-file-parsing  
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-2026-21345 · Severity: high · CVSS 7.8 · Published 2026-02-10

Substance3D Stager is Adobe's 3D asset preparation and staging tool used by designers and artists. A memory read vulnerability in file parsing could allow an attacker to crash the application or execute arbitrary code if a victim opens a specially crafted malicious file.

Technologies: [Adobe Substance 3d Stager](https://junglewise.ai/threats/technologies/substance-3d-stager), [Adobe Substance3D Stager](https://junglewise.ai/threats/technologies/substance3d-stager), [Apple macOS](https://junglewise.ai/threats/technologies/macos), [Microsoft Windows](https://junglewise.ai/threats/technologies/windows). Vendors: [Adobe](https://junglewise.ai/threats/vendors/adobe), [Apple](https://junglewise.ai/threats/vendors/apple), [Microsoft](https://junglewise.ai/threats/vendors/microsoft).

## Quick answers

**Is CVE-2026-21345 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-21345 being exploited in the wild.

**How severe is CVE-2026-21345?** High severity, with a CVSS score of 7.8, published 10 February 2026.

**Which products and versions are affected?** Adobe Substance3D Stager 3.1.6 and earlier.

**Is there a fix for CVE-2026-21345?** 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-2026-21345 attacked?** It is attacked with local access, in a software library.

**Am I affected by CVE-2026-21345?** Check whether you run Adobe Substance 3d Stager, Adobe Substance3D Stager, Apple macOS or one of the others listed 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 (CWE-125) occurring when Substance3D Stager parses a crafted file, causing the application to read past the end of an allocated memory structure. The attack vector requires user interaction: a victim must open a malicious file to trigger the vulnerable code path. Successful exploitation could result in code execution in the context of the current user, potentially leading to arbitrary code execution with user privileges. Patches are available in versions after 3.1.6.

## Affected products

- Adobe Substance3D Stager 3.1.6 and earlier

## Timeline

- 2026-02-10: disclosed

## References

- [https://helpx.adobe.com/security/products/substance3d_stager/apsb26-20.html](https://helpx.adobe.com/security/products/substance3d_stager/apsb26-20.html)

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