CVE-2026-21339
📋 TL;DR
Substance3D Designer versions 15.1.0 and earlier contain an out-of-bounds read vulnerability that could allow memory exposure. Attackers could exploit this by tricking users into opening malicious files, potentially disclosing sensitive information from memory. This affects all users running vulnerable versions of Adobe Substance3D Designer.
💻 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 credential theft or intellectual property loss.
Likely Case
Limited memory disclosure of application data or system information, potentially enabling further attacks or reconnaissance.
If Mitigated
No impact if users don't open untrusted files or if the application is patched.
🎯 Exploit Status
Exploitation requires user interaction (opening malicious file) and knowledge of memory layout.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: 15.1.1 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. Install available updates. 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 memory access.
🧯 If You Can't Patch
- Implement strict file handling policies to prevent opening untrusted Substance3D Designer files.
- Use application control solutions to restrict Substance3D Designer from accessing sensitive memory regions.
🔍 How to Verify
Check if Vulnerable:
Check Substance3D Designer version in Help > About. If version is 15.1.0 or earlier, you are vulnerable.Check Version:
Not applicable - check via application GUIVerify Fix Applied:
Verify version is 15.1.1 or later in Help > About.📡 Detection & Monitoring
Log Indicators:
- Application crashes or unusual memory access patterns in system logs
Network Indicators:
- No network indicators - local file-based exploit
SIEM Query:
EventID for application crashes from Substance3D Designer process