Is CVE-2026-103840 exploited in the wild?

No. Junglewise Threat Intelligence has no report of CVE-2026-103840 being exploited in the wild.

How severe is CVE-2026-103840?

High severity, with a CVSS score of 7.8, published 13 October 2026.

Which products and versions are affected?

Adobe Substance 3d Stager 3.1.8 and earlier.

Is there a fix for CVE-2026-103840?

Yes: fixed in 3.1.9. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.

How is CVE-2026-103840 attacked?

It is attacked with local access.

Am I affected by CVE-2026-103840?

Check whether you run Adobe Substance 3d Stager 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.

CVE-2026-103840: Adobe Substance 3D Stager out-of-bounds read in file parsing

CVE-2026-103840 · Severity: high · CVSS 7.8 · Published 2026-10-13

Adobe Substance 3D Stager is a 3D design and content creation tool used by professionals. Multiple out-of-bounds memory access vulnerabilities in file parsing could allow an attacker to execute arbitrary code when a victim opens a specially crafted malicious file. An attacker could gain complete control over the user's system, access sensitive data, or use the compromised computer to launch further attacks.

Technologies: Adobe Substance 3d Stager. Vendors: Adobe.

Quick answers

Is CVE-2026-103840 exploited in the wild?: No. Junglewise Threat Intelligence has no report of CVE-2026-103840 being exploited in the wild.
How severe is CVE-2026-103840?: High severity, with a CVSS score of 7.8, published 13 October 2026.
Which products and versions are affected?: Adobe Substance 3d Stager 3.1.8 and earlier.
Is there a fix for CVE-2026-103840?: Yes: fixed in 3.1.9. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.
How is CVE-2026-103840 attacked?: It is attacked with local access.
Am I affected by CVE-2026-103840?: Check whether you run Adobe Substance 3d Stager 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.

How to fix

Fixed in: 3.1.9

Technical details

The vulnerability is an out-of-bounds read (CWE-125) that occurs when parsing crafted files in Substance 3D Stager versions 3.1.8 and earlier. The attack requires local access and user interaction: a victim must open a malicious file. Exploitation allows arbitrary code execution in the context of the current user with no special privileges required.

Affected products

Adobe Substance 3D Stager 3.1.8 and earlier

Timeline

2026-10-13: disclosed
2026-10-13: patched

References

https://www.adobe.com/trust/security/products/substance3d-stager/apsb26-170.html

This page as Markdown. Free to reuse under CC BY 4.0 with a link back.