CVE-2026-21308
📋 TL;DR
Substance3D Designer versions 15.0.3 and earlier contain an out-of-bounds read vulnerability that could allow memory disclosure. Attackers could exploit this by tricking users into opening malicious files, potentially exposing sensitive information from memory. Users of affected Substance3D Designer versions are at risk.
💻 Affected Systems
- Adobe Substance3D Designer
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
An attacker successfully exploits the vulnerability to read sensitive data from memory, potentially exposing credentials, encryption keys, or other confidential information.
Likely Case
Limited information disclosure from memory, potentially exposing application data or system information but not necessarily critical secrets.
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). No public exploit code is known at this time.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: 15.0.4 or later
Vendor Advisory: https://helpx.adobe.com/security/products/substance3d_designer/apsb26-13.html
Restart Required: Yes
Instructions:
1. Open Substance3D Designer. 2. Go to Help > Check for Updates. 3. Follow prompts to install version 15.0.4 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 impact
🧯 If You Can't Patch
- Implement strict file handling policies to prevent opening untrusted Substance3D Designer files
- Monitor for suspicious file access attempts and memory-related crashes in the application
🔍 How to Verify
Check if Vulnerable:
Check Substance3D Designer version in Help > About. If version is 15.0.3 or earlier, the system is vulnerable.Check Version:
In Substance3D Designer: Help > AboutVerify Fix Applied:
Verify version is 15.0.4 or later in Help > About after applying update.📡 Detection & Monitoring
Log Indicators:
- Application crashes with memory access violations
- Unexpected file opening events from untrusted sources
Network Indicators:
- Downloads of Substance3D Designer files from untrusted sources
SIEM Query:
EventID=1000 AND ProcessName="Substance3D Designer.exe" AND ExceptionCode=0xc0000005