CVE-2026-21305
📋 TL;DR
Substance3D Painter versions 11.0.3 and earlier contain an out-of-bounds write vulnerability that could allow attackers to execute arbitrary code on a victim's system. This affects users who open malicious files with the vulnerable software. Successful exploitation requires user interaction but could lead to full system compromise.
💻 Affected Systems
- Adobe Substance3D Painter
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Complete system takeover with attacker gaining the same privileges as the current user, potentially leading to data theft, ransomware deployment, or persistent backdoor installation.
Likely Case
Local privilege escalation leading to unauthorized access to sensitive files, system configuration changes, or installation of additional malware.
If Mitigated
Limited impact due to user awareness training preventing malicious file opening, with potential application crash but no code execution.
🎯 Exploit Status
Exploitation requires user to open a specially crafted malicious file. No public exploit code is currently available.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: 11.0.4 or later
Vendor Advisory: https://helpx.adobe.com/security/products/substance3d_painter/apsb26-10.html
Restart Required: Yes
Instructions:
1. Open Substance3D Painter. 2. Navigate to Help > Check for Updates. 3. Follow prompts to install version 11.0.4 or later. 4. Restart the application.
🔧 Temporary Workarounds
Restrict file opening
allConfigure application to only open trusted files from verified sources
User training
allEducate users to avoid opening untrusted .spp files
🧯 If You Can't Patch
- Implement application whitelisting to prevent execution of unauthorized code
- Use endpoint detection and response (EDR) solutions to monitor for suspicious process behavior
🔍 How to Verify
Check if Vulnerable:
Check Help > About in Substance3D Painter and verify version is 11.0.3 or earlierCheck Version:
Not applicable - check via application GUIVerify Fix Applied:
Confirm version is 11.0.4 or later in Help > About📡 Detection & Monitoring
Log Indicators:
- Application crashes when opening files
- Unusual process spawning from Substance3D Painter
Network Indicators:
- Unexpected outbound connections after file opening
SIEM Query:
process_name:"Substance3D Painter.exe" AND (event_type:crash OR child_process_spawn)