CVE-2026-21340
📋 TL;DR
Substance3D Designer versions 15.1.0 and earlier contain an out-of-bounds read vulnerability that could allow memory exposure. An attacker could exploit this by tricking a user into opening a malicious file, potentially disclosing sensitive information from memory. This affects users of Adobe Substance3D Designer software.
💻 Affected Systems
- Adobe Substance3D Designer
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Sensitive information like passwords, encryption keys, or proprietary data could be extracted from memory, leading to data breaches or further attacks.
Likely Case
Limited information disclosure from memory, potentially exposing some application data but not full system compromise.
If Mitigated
No impact if users don't open untrusted files and proper file validation is in place.
🎯 Exploit Status
Exploitation requires user interaction (opening malicious file). No public exploit code is currently known.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: 15.2.0 or later
Vendor Advisory: https://helpx.adobe.com/security/products/substance3d_designer/apsb26-19.html
Restart Required: Yes
Instructions:
1. Open Substance3D Designer. 2. Go to Help > Check for Updates. 3. Follow prompts to install version 15.2.0 or later. 4. Restart the application.
🔧 Temporary Workarounds
Restrict file opening
allOnly open trusted Substance3D Designer files from verified sources
Application sandboxing
allRun Substance3D Designer in a sandboxed environment to limit potential damage
🧯 If You Can't Patch
- Implement strict file validation policies to prevent opening untrusted Substance3D Designer files
- Monitor for suspicious file access patterns and memory usage anomalies
🔍 How to Verify
Check if Vulnerable:
Check Substance3D Designer version in Help > About. If version is 15.1.0 or earlier, system is vulnerable.Check Version:
Not applicable - check via application GUIVerify Fix Applied:
Verify version is 15.2.0 or later in Help > About after update.📡 Detection & Monitoring
Log Indicators:
- Unexpected application crashes
- Large memory reads from Substance3D Designer process
- Access to suspicious file types
Network Indicators:
- No network indicators - local file-based exploit
SIEM Query:
EventID=1000 OR EventID=1001 AND ProcessName="Substance3D Designer.exe" AND Version<15.2.0