Adobe Substance 3D Stager: Out-of-bounds read when parsing crafted files
Summary
Adobe Substance 3D Stager 3.1.8 and earlier contains an out-of-bounds read when parsing a crafted file, which can read past the end of an allocated memory structure. An attacker can use this to execute code with the rights of the current user. Exploitation requires that a victim opens a malicious file. Adobe is not aware of any exploits in the wild.
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), released with APSB26-170 on October 13, 2026
Workaround
- Unknown. Adobe documents no configuration-based mitigation.
- Until the update is installed, do not open Stager files from untrusted sources.
Exploitation
- Adobe is not aware of any exploits in the wild.
- No public proof of concept found at the time of research.
- Attack vector local (AV:L), no privileges required, user interaction required (UI:R).
Our recommendation
- Update Adobe Substance 3D Stager to version 3.1.9 via the Creative Cloud desktop app or the Admin Console.
- Until patched, only open Stager files from trusted sources.
- Check which systems have Stager installed and prioritise design and media teams that exchange 3D files with external parties.
- Note that APSB26-170 covers several related CVEs; apply the full update.
Public exploits
PoC-in-GitHub, Metasploit and Exploit-DB list nothing for this CVE.
Research sources
- Adobe Security Bulletin APSB26-170 www.adobe.com
- CVE record copy (Vulners) vulners.com
- CVE record copy (threatint) cve.threatint.com
- Aggregator entry (Strix) www.strix.ai
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, 00:15.
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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