CVE-2026-21300 Adobe CVE debrief

Who should care

Users of Substance 3D Modeler versions 1.22.4 and earlier should review and apply patches or updates to mitigate potential denial-of-service risks. This includes operators, platform administrators, vulnerability management teams, and security teams who need to assess the impact of this vulnerability on their environments and take necessary actions to protect against potential exploitation. Additionally, defenders should restrict user access to untrusted file sources and implement monitoring for suspicious file interactions to reduce the attack surface and detect potential threats in a timely manner. They should also consider compensating controls for exposed systems while remediation is scheduled and verified, and track exceptions and retest remediated assets to ensure the effectiveness of their security measures. Furthermore, defenders should check relevant monitoring, detection, and logs for exposed assets that need extra review to identify potential security incidents. By taking these steps, defenders can help prevent or minimize the impact of potential attacks exploiting this vulnerability. The CVE record and vendor advisory provide additional context for defenders to assess and mitigate the vulnerability effectively. Defenders should also consider the operational impact of this vulnerability on their environments and prioritize defensive actions accordingly. They should review the official CVE Program record and NVD vulnerability detail page for more information on the vulnerability and its potential impact. By expanding their knowledge of the vulnerability and its potential effects, defenders can make informed decisions about how to protect their environments and prioritize defensive actions to address the most critical risks. In addition, defenders should consider the source-confidence limits of the information available and plan accordingly to ensure that they are adequately prepared to address potential threats. Overall, a thorough review of the vulnerability and its potential impact is essential to developing an effective defensive strategy. This includes reviewing the affected product context, defensive impact, and source-grounded technical framing to

Technical summary

Substance3D - Modeler versions 1.22.4 and earlier are affected by a NULL Pointer Dereference vulnerability. This vulnerability could lead to application denial-of-service and requires user interaction to exploit, as a victim must open a malicious file. The affected product is a 3D modeling software, and the vulnerability has a medium severity score. Users should review and apply patches or updates to mitigate potential risks.

Defensive priority

Medium-priority defensive review recommended due to potential for denial-of-service through malicious file interaction.

Recommended defensive actions

• Review and apply vendor-provided patches or updates for Substance 3D Modeler.
• Restrict user access to untrusted file sources.
• Implement monitoring for suspicious file interactions.
• Track exceptions and retest remediated assets.
• Check relevant monitoring, detection, and logs for exposed assets.
• Review compensating controls for exposed systems.
• Confirm whether affected product deployments exist in managed environments.

Evidence notes

Official CVE Program record and NVD vulnerability detail page confirm NULL Pointer Dereference vulnerability in Substance 3D Modeler versions 1.22.4 and earlier. Vendor advisory from Adobe provides additional context. The vulnerability requires user interaction to exploit, as a victim must open a malicious file. Defenders should verify affected product deployments, review official advisories, and plan for vendor-supported updates or mitigations.

Sources and references

Methodology and review provenance

AI-assisted synthesis based on stored public vulnerability evidence. System validation, approval state, and publication status do not by themselves establish human review of this revision. PatchSiren helps prioritize defensive review and does not prove exposure or remediation on any system.