CVE-2026-21303 Substance3D - Modeler | Out-of-bounds Read (CWE-125)

Medium 5.5 Published 13 Jan 2026 Updated 27 Aug 2026

An attacker can disclose sensitive memory information by tricking a user into opening a malicious file in Substance3D Modeler.

Exploited in the wild: Not known
Login needed: Not needed
Attackable: Local or same network only
Victim action needed: A user has to click or open something
Fix: None listed

What is CVE-2026-21303?

CVE-2026-21303 is a medium-severity vulnerability in Adobe Substance3D - Modeler, published on 13 Jan 2026. It can only be exploited from the same machine or local network, and only if a user opens a file or follows a link.

Official description

Substance3D - Modeler versions 1.22.4 and earlier are affected by an Out-of-bounds Read vulnerability that could lead to memory exposure. An attacker could leverage this vulnerability to disclose sensitive information stored in memory. Exploitation of this issue requires user interaction in that a victim must open a malicious file.

Weakness: CWE-125

Which versions are affected by CVE-2026-21303?

It affects 1 product.

Products include Adobe Substance 3d Modeler.

How do I fix CVE-2026-21303?

No fix has been published for CVE-2026-21303 yet. Limit exposure of the affected software until one is available.

Is CVE-2026-21303 being exploited?

There is no known exploitation of CVE-2026-21303 in the wild and no public exploit code.

Sources

Also known as GHSA-8r2v-q8wh-86gh.