# CVE-2026-21344: Adobe Substance3D Stager out-of-bounds read in file parsing

Source: https://junglewise.ai/threats/cve-2026-21344-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-2026-21344 · Severity: high · CVSS 7.8 · Published 2026-02-10

Substance3D Stager is Adobe's 3D asset staging and preparation software used by designers and artists. Versions 3.1.6 and earlier contain an out-of-bounds read vulnerability triggered when opening malicious files, which could allow an attacker to execute code with the same privileges as the user. Exploitation requires a user to open a specially crafted file, making social engineering or file-delivery attacks the primary threat vector.

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-2026-21344 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-21344 being exploited in the wild.

**How severe is CVE-2026-21344?** 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-2026-21344?** 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-2026-21344 attacked?** It is attacked with local access.

**Am I affected by CVE-2026-21344?** 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 flaw in Substance3D Stager's file parsing logic, affecting versions 3.1.6 and earlier. When processing a crafted input file, the parser reads past the end of an allocated memory structure, potentially exposing sensitive data or enabling code execution through memory corruption. The attack requires user interaction (opening a malicious file) and is not network-based. An attacker can leverage this vulnerability to execute arbitrary code in the context of the current user. Adobe has released patches to address this issue.

## 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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