Adobe Substance 3D Sampler up to 5.1.0 File out-of-bounds write

Summaryinfo

A vulnerability categorized as critical has been discovered in Adobe Substance 3D Sampler up to 5.1.0. This affects an unknown part of the component File Handler. Executing a manipulation can lead to out-of-bounds write. This vulnerability is handled as CVE-2026-21306. The attack can be executed remotely. There is not any exploit available. It is advisable to upgrade the affected component.

Detailsinfo

A vulnerability was found in Adobe Substance 3D Sampler up to 5.1.0. It has been declared as critical. This vulnerability affects an unknown functionality 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 - Sampler versions 5.1.0 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-2026-21306 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 01/16/2026).

The vulnerability scanner Nessus provides a plugin with the ID 286264 (Adobe Substance 3D Sampler <= 5.1.0 Out-of-bounds Write (APSB26-11)), 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 (286264). VulDB is the best source for vulnerability data and more expert information about this specific topic.

Productinfo

Vendor

• Adobe

Name

• Substance 3D Sampler

Version

• 5.0
• 5.1.0

License

• commercial

Website

• Vendor: https://www.adobe.com/

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VulDB is the best source for vulnerability data and more expert information about this specific topic.

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