CVE-2026-21336 is a NULL Pointer Dereference vulnerability classified under CWE-476, affecting Adobe Substance3D - Designer versions 15.1.0 and earlier. This vulnerability arises when the application attempts to dereference a null pointer, typically due to improper handling of input data, which leads to an application crash. The crash results in a denial-of-service (DoS) condition, disrupting the availability of the software. Exploitation requires user interaction, specifically the victim opening a crafted malicious file designed to trigger the null pointer dereference. The vulnerability does not allow for code execution or data leakage, thus confidentiality and integrity remain unaffected. The CVSS v3.1 base score is 5.5, with the vector indicating local attack vector (AV:L), low attack complexity (AC:L), no privileges required (PR:N), user interaction required (UI:R), unchanged scope (S:U), no impact on confidentiality or integrity (C:N/I:N), and high impact on availability (A:H). No patches or exploit code are currently publicly available, and no known exploitation in the wild has been reported. This vulnerability primarily impacts the stability and availability of the Substance3D - Designer application, which is widely used in digital content creation and design workflows.

For European organizations, the primary impact of CVE-2026-21336 is operational disruption due to denial-of-service of Adobe Substance3D - Designer. Organizations relying on this software for 3D design, digital content creation, or related workflows may experience productivity loss if users open malicious files, intentionally or accidentally. While the vulnerability does not compromise sensitive data or system integrity, the availability impact could delay project timelines and increase support costs. Industries such as media, entertainment, advertising, and manufacturing that use Substance3D tools extensively could be more affected. Additionally, organizations with remote or hybrid work environments may face increased risk if users receive malicious files via email or collaboration platforms. The lack of known exploits reduces immediate risk, but the requirement for user interaction means social engineering or phishing could be leveraged to trigger the vulnerability.

1. Monitor Adobe’s official channels for patches or updates addressing this vulnerability and apply them promptly once available. 2. Implement strict file handling policies: restrict opening of Substance3D files from untrusted or unknown sources. 3. Educate users on the risks of opening files from unverified senders, emphasizing caution with email attachments and downloads. 4. Employ endpoint protection solutions capable of detecting anomalous application crashes or suspicious file activity related to Substance3D. 5. Use application whitelisting or sandboxing to isolate Substance3D processes and limit the impact of crashes. 6. Maintain regular backups of critical project files to minimize disruption in case of application failure. 7. Consider network-level controls to scan and filter potentially malicious files before delivery to end users. 8. Conduct periodic security awareness training focused on social engineering tactics that could lead to exploitation.