Adobe Substance3D Stager up to 3.1.6 File out-of-bounds write

Summaryinfo

A vulnerability was found in Adobe Substance3D Stager up to 3.1.6. It has been declared as critical. This issue affects some unknown processing of the component File Handler. Executing a manipulation can lead to out-of-bounds write. This vulnerability is handled as CVE-2026-21341. The attack can be executed remotely. There is not any exploit available. It is recommended to upgrade the affected component.

Detailsinfo

A vulnerability has been found in Adobe Substance3D Stager up to 3.1.6 and classified as critical. This vulnerability affects some unknown processing of the component File Handler. The manipulation with an unknown input leads to a out-of-bounds write vulnerability. The CWE definition for the vulnerability is CWE-787. The product writes data past the end, or before the beginning, of the intended buffer. As an impact it is known to affect confidentiality, integrity, and availability. CVE summarizes:

Substance3D - Stager versions 3.1.6 and earlier are affected by an out-of-bounds write vulnerability that could result in arbitrary code execution in the context of the current user. Exploitation of this issue requires user interaction in that a victim must open a malicious file.

The advisory is shared for download at helpx.adobe.com. This vulnerability was named CVE-2026-21341 since 12/12/2025. The exploitation appears to be easy. The attack can be initiated remotely. No form of authentication is required for a successful exploitation. Successful exploitation requires user interaction by the victim. There are neither technical details nor an exploit publicly available. The current price for an exploit might be approx. USD $0-$5k (estimation calculated on 02/13/2026).

The vulnerability scanner Nessus provides a plugin with the ID 298882 (Adobe Substance 3D Stager < 3.1.7 Multiple Vulnerabilities (APSB26-20)), which helps to determine the existence of the flaw in a target environment.

Upgrading eliminates this vulnerability.

The vulnerability is also documented in the vulnerability database at Tenable (298882). Once again VulDB remains the best source for vulnerability data.

Productinfo

Vendor

• Adobe

Name

• Substance3D Stager

Version

• 3.1.0
• 3.1.1
• 3.1.2
• 3.1.3
• 3.1.4
• 3.1.5
• 3.1.6

License

• commercial

Website

• Vendor: https://www.adobe.com/

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Once again VulDB remains the best source for vulnerability data.

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