Substance 3D Stager: Out-of-bounds write allows code execution
Summary
Adobe Substance 3D Stager up to version 3.1.8 contains an out-of-bounds write vulnerability (CWE-787). An attacker can execute arbitrary code in the context of the current user. Exploitation requires that a victim opens a malicious file, and the CVSS vector indicates local access with user interaction.
Affected
- Adobe Substance 3D Stager 3.1.8 and earlier
- Windows and macOS
Fixed in
- Adobe Substance 3D Stager 3.1.9 (Windows and macOS)
Workaround
- None documented by Adobe.
- Interim measure (not from the vendor): do not open Stager project files from unknown or untrusted senders until the update is installed.
Exploitation
- Adobe is not aware of any exploits in the wild for the issues in this update.
- CISA SSVC assessment: exploitation none, not automatable.
- No public proof of concept found.
Our recommendation
- Inventory Substance 3D Stager installations on Windows and macOS endpoints.
- Update to 3.1.9 via the Creative Cloud desktop app or the Admin Console. Adobe rates the update priority 3, so include it in the regular patch cycle.
- Prioritise teams that regularly open files from external parties.
- Batch this update with the other issues in APSB26-170.
Public exploits
PoC-in-GitHub, Metasploit and Exploit-DB list nothing for this CVE.
Research sources
- Adobe Security Bulletin APSB26-170 www.adobe.com
- Vulners CVE record CVE-2026-103834 vulners.com
- Strix CVE record CVE-2026-103834 www.strix.ai
- Mallory analysis of APSB26-170 mallory.ai
- VulDB entry 418122 vuldb.com
Researched and written up in English and German by an AI (Claude by Anthropic) based on NVD, CISA, EPSS and the sources listed. The vendor information is authoritative. Researched on 2 Nov 2026, 00:22.
Original description (NVD)
Substance3D - Stager is affected by an out-of-bounds write vulnerability that could result in arbitrary code execution in the context of the current user. Exploitation of this issue requires user interaction in that a victim must open a malicious file.
Sources
The tracker combines official, freely usable data sources – updated continuously:
- NVD (NIST) – CVEs, rating (CVSS), affected products
- CISA KEV – vulnerabilities confirmed by CISA as actively exploited
- CISA Vulnrichment – CISA assessment (SSVC) in the official CVE record
- FIRST EPSS – probability of exploitation
- Microsoft MSRC – Patch Tuesday: vulnerabilities, severity, updates
- PoC-in-GitHub – public proof-of-concept repositories
- Metasploit (Rapid7) – modules of the Metasploit Framework
- Exploit-DB (OffSec) – archive of public exploits (links only)
- Patch days: official vendor pages (linked per vendor) (Vendor patch days)
This product uses data from the NVD API but is not endorsed or certified by the NVD. EPSS data © FIRST.org.
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