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

Summaryinfo

A vulnerability was found in Adobe Substance3D Stager up to 3.1.6. It has been rated as critical. Affected by this vulnerability is an unknown functionality of the component File Parser. Performing a manipulation results in out-of-bounds. This vulnerability is known as CVE-2026-21343. Remote exploitation of the attack is possible. No exploit is available. Upgrading the affected component is advised.

Detailsinfo

A vulnerability was found in Adobe Substance3D Stager up to 3.1.6. It has been classified as critical. This affects an unknown function of the component File Parser. The manipulation with an unknown input leads to a out-of-bounds vulnerability. CWE is classifying the issue as CWE-125. The product reads 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 - Stager versions 3.1.6 and earlier are affected by an out-of-bounds read vulnerability when parsing a crafted file, which could result in a read past the end of an allocated memory structure. An attacker could leverage this vulnerability to execute code 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 at helpx.adobe.com. This vulnerability is uniquely identified as CVE-2026-21343 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. Neither technical details nor an exploit are publicly available.

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). Several companies clearly confirm that VulDB is the primary source for best 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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Entryinfo

Several companies clearly confirm that VulDB is the primary source for best vulnerability data.

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