CVE-2026-21300 is a NULL Pointer Dereference vulnerability (CWE-476) identified in Adobe Substance3D - Modeler, affecting versions 1.22.4 and earlier. This vulnerability arises when the application attempts to access or dereference a pointer that has a NULL value, leading to an application crash and denial-of-service (DoS) condition. The attack vector requires local user interaction, specifically the opening of a maliciously crafted file designed to trigger the NULL pointer dereference. The vulnerability does not compromise confidentiality or integrity but impacts availability by causing the application to terminate unexpectedly. The CVSS v3.1 base score is 5.5 (medium severity), reflecting the limited attack vector (local), low complexity, no privileges required, and user interaction needed. No known exploits have been reported in the wild, and Adobe has not yet released a patch. The vulnerability is relevant primarily to users of the Substance3D - Modeler software, which is used in 3D modeling and digital content creation workflows. Given the nature of the flaw, attackers could disrupt creative workflows by causing application crashes, potentially impacting productivity and operational continuity in environments relying on this software.

For European organizations, the primary impact of CVE-2026-21300 is the potential disruption of digital content creation workflows due to application crashes. This can lead to productivity losses, especially in sectors heavily reliant on 3D modeling and design such as media, entertainment, advertising, and manufacturing design. While the vulnerability does not expose sensitive data or allow code execution, repeated denial-of-service conditions could degrade user experience and delay project timelines. Organizations using Substance3D - Modeler in collaborative environments may face operational bottlenecks if multiple users are affected. The requirement for user interaction limits remote exploitation, reducing the risk of widespread automated attacks. However, targeted attacks via malicious files sent through email or file sharing could still pose a threat. The absence of a patch means organizations must rely on interim mitigations until Adobe releases an update. Overall, the impact is moderate but relevant for creative industries and agencies using this software in Europe.

1. Educate users to avoid opening files from untrusted or unknown sources, especially unsolicited attachments or downloads related to Substance3D - Modeler. 2. Implement strict file scanning and sandboxing of files before they are opened in the application to detect potentially malicious content. 3. Use application whitelisting and restrict installation of unauthorized software to limit exposure. 4. Monitor Adobe’s security advisories closely for the release of patches or updates addressing this vulnerability and apply them promptly. 5. Consider isolating workstations running Substance3D - Modeler from critical network segments to reduce potential impact of denial-of-service conditions. 6. Maintain regular backups of project files and configurations to minimize disruption in case of application crashes. 7. Employ endpoint detection and response (EDR) tools to identify abnormal application behavior that could indicate exploitation attempts. 8. Coordinate with IT and security teams to establish incident response procedures specific to application availability issues caused by this vulnerability.