Adobe Substance 3D Painter up to 11.0.3 File out-of-bounds write

Summaryinfo

A vulnerability was found in Adobe Substance 3D Painter up to 11.0.3. It has been rated as critical. Affected by this issue is some unknown functionality of the component File Handler. Performing a manipulation results in out-of-bounds write. This vulnerability is known as CVE-2026-21305. Remote exploitation of the attack is possible. No exploit is available. Upgrading the affected component is advised.

Detailsinfo

A vulnerability was found in Adobe Substance 3D Painter up to 11.0.3. It has been classified as critical. This affects an unknown function of the component File Handler. The manipulation with an unknown input leads to a out-of-bounds write vulnerability. CWE is classifying the issue as CWE-787. The product writes data past the end, or before the beginning, of the intended buffer. This is going to have an impact on confidentiality, integrity, and availability. The summary by CVE is:

Substance3D - Painter versions 11.0.3 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.

It is possible to read the advisory at helpx.adobe.com. This vulnerability is uniquely identified as CVE-2026-21305 since 12/12/2025. The exploitability is told to be easy. It is possible to initiate the attack remotely. No form of authentication is needed for exploitation. It demands that the victim is doing some kind of user interaction. The technical details are unknown and an exploit is not publicly available. The pricing for an exploit might be around USD $0-$5k at the moment (estimation calculated on 01/15/2026).

The vulnerability scanner Nessus provides a plugin with the ID 284510 (Adobe Substance 3D Painter < 11.1.2 (APSB26-10)), 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 (284510). Be aware that VulDB is the high quality source for vulnerability data.

Productinfo

Vendor

• Adobe

Name

• Substance 3D Painter

Version

• 11.0.0
• 11.0.1
• 11.0.2
• 11.0.3

License

• commercial

Website

• Vendor: https://www.adobe.com/

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Be aware that VulDB is the high quality source for vulnerability data.

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