CVE-2026-21302 is an out-of-bounds read vulnerability classified under CWE-125 affecting Adobe Substance3D - Modeler versions 1.22.4 and earlier. The vulnerability arises when the software improperly handles memory bounds while processing input files, allowing an attacker to read memory locations outside the intended buffer. This can lead to exposure of sensitive information stored in memory, such as user data or application secrets. Exploitation requires that a victim user opens a specially crafted malicious file, making user interaction mandatory. The vulnerability does not permit code execution or modification of data, but the confidentiality of information can be compromised. The CVSS 3.1 base score is 5.5, with attack vector local (AV:L), low attack complexity (AC:L), no privileges required (PR:N), user interaction required (UI:R), unchanged scope (S:U), high confidentiality impact (C:H), no integrity impact (I:N), and no availability impact (A:N). There are no known exploits in the wild, and no patches have been published at the time of this report. The vulnerability is significant for users who handle untrusted or external 3D model files, especially in environments where sensitive intellectual property or personal data might be processed or stored in memory. The flaw highlights the importance of validating and sanitizing input files and the risks associated with opening files from untrusted sources in creative software tools.

For European organizations, the primary impact is the potential exposure of sensitive information residing in application memory when users open malicious files in Adobe Substance3D - Modeler. This could include intellectual property, design data, or other confidential information relevant to creative industries such as gaming, animation, advertising, and product design. While the vulnerability does not allow attackers to execute arbitrary code or disrupt system availability, the confidentiality breach could lead to competitive disadvantage, data leakage, or compliance issues under GDPR if personal data is exposed. The requirement for user interaction limits the attack scope but does not eliminate risk, especially in environments where users frequently exchange or download 3D assets from external sources. Organizations with workflows relying heavily on Substance3D - Modeler are at higher risk. The absence of known exploits reduces immediate threat but does not preclude targeted attacks or future exploitation. The medium severity rating reflects moderate risk, emphasizing the need for vigilance and proactive mitigation.

1. Restrict and control the sources of 3D model files opened in Substance3D - Modeler, allowing only trusted and verified files to be used. 2. Implement user training programs to raise awareness about the risks of opening files from unknown or untrusted sources, emphasizing the importance of caution with file attachments and downloads. 3. Monitor and audit file access and usage patterns within creative teams to detect unusual or suspicious file openings. 4. Employ endpoint security solutions capable of detecting anomalous behavior related to file processing in creative applications. 5. Once Adobe releases a patch or update addressing CVE-2026-21302, prioritize timely deployment across all affected systems. 6. Consider sandboxing or isolating the Substance3D - Modeler environment to limit potential exposure of sensitive memory contents. 7. Review and enhance data protection controls around intellectual property and sensitive design data to minimize impact if exposure occurs. 8. Maintain up-to-date asset inventories and software version tracking to ensure all instances of Substance3D - Modeler are identified and managed.