Adobe Substance 3D Stager: Out-of-bounds read when opening a crafted file
Summary
Adobe Substance 3D Stager 3.1.8 and earlier contains an out-of-bounds read flaw (CWE-125) when parsing a crafted file. A successful attack can read past the end of an allocated memory structure and could lead to code execution in the context of the current user. Exploitation requires a victim to open a malicious file, so the main risk comes from files received by email, downloads or shared projects.
Affected
- Adobe Substance 3D Stager 3.1.8 and earlier on Windows and macOS
Fixed in
- Adobe Substance 3D Stager 3.1.9 (Adobe bulletin APSB26-170, published 13 October 2026)
Workaround
Unknown. No vendor workaround is documented.
- Until the update is installed, do not open Stager files from untrusted sources.
Exploitation
- Adobe is not aware of any exploits in the wild for the issues in this update.
- CISA SSVC assessment: exploitation none, automatable no, technical impact total.
- No public proof of concept found.
Our recommendation
- Identify 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.
- Do not open Stager files from untrusted sources until the update is applied.
- Verify the update status on all affected workstations.
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 CNA record CVE-2026-103841 vulners.com
- VulDB entry 418133 vuldb.com
- Strix AI CVE-2026-103841 www.strix.ai
- Mallory summary of APSB26-170 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, 00:16.
Original description (NVD)
Substance3D - Stager is affected by an out-of-bounds read vulnerability when parsing a crafted file, which could result in a read past the end of an allocated memory structure. An attacker could leverage this vulnerability to execute code 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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