Adobe Substance 3D Stager: Out-of-bounds write allows arbitrary 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.
Affected
- Adobe Substance 3D Stager 3.1.8 and earlier
- Platforms: Windows and macOS
Fixed in
- Adobe Substance 3D Stager 3.1.9 (fixed in APSB26-170)
Workaround
Unknown. Avoid opening Stager files from untrusted sources until the update is installed.
Exploitation
- Adobe is not aware of any exploits in the wild for the issues in APSB26-170.
- CISA SSVC: exploitation none, automatable no, technical impact total.
- No public proof of concept found.
Our recommendation
- Inventory Adobe Substance 3D Stager installations on Windows and macOS endpoints.
- Update to version 3.1.9 or later via the Creative Cloud desktop app or the Admin Console.
- Restrict use of Stager files from untrusted sources until patched.
- This update also covers the other CVEs in APSB26-170, so one patch addresses the batch.
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-2026-103835 vulners.com
- Strix CVE-2026-103835 www.strix.ai
- CVE Threatint CVE-2026-103835 cve.threatint.com
- Mallory APSB26-170 story mallory.ai
- Vulners Nessus plugin APSB26-170 vulners.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.
Affected? We can help.
We check whether your systems are affected, install updates and close the gap – continuously with the System Health Checker if you wish.