CVE-2026-79906: Substance3D Modeler RCE Vulnerability

CVE-2026-79906 Overview

CVE-2026-79906 is an out-of-bounds write vulnerability [CWE-787] in Adobe Substance3D Modeler. Attackers can achieve arbitrary code execution in the context of the current user by delivering a malicious file. Exploitation requires the victim to open the crafted file, making this a client-side attack scenario relevant to designers, artists, and 3D content creators who routinely process untrusted assets.

Adobe addressed the flaw in security bulletin APSB26-155. The vulnerability is rated high severity based on local attack vector with low complexity and no privileges required.

Critical Impact
Successful exploitation grants attackers arbitrary code execution with the privileges of the logged-in user, enabling data theft, persistence, and lateral movement from the compromised workstation.

Affected Products

Adobe Substance3D Modeler (see APSB26-155 for affected versions)
Windows and macOS installations of Substance3D Modeler
Environments processing untrusted 3D model files

Discovery Timeline

2026-09-22 - CVE-2026-79906 published to the National Vulnerability Database
2026-09-23 - Last updated in NVD database

Technical Details for CVE-2026-79906

Vulnerability Analysis

The flaw is classified as an out-of-bounds write [CWE-787], meaning the application writes data past the boundary of an allocated buffer while parsing file input. In Substance3D Modeler, this occurs during processing of a crafted project or asset file. The corruption of adjacent memory structures can be steered by an attacker to hijack control flow.

The attack requires local access and user interaction. A victim must open a malicious file, typically delivered by email, download, or shared asset repository. Because Substance3D Modeler runs in the user session, code executes with the user's rights and inherits access to documents, credentials cached by the OS, and network shares.

Creative and media production environments frequently exchange third-party model files, expanding the practical attack surface. Refer to Adobe's security bulletin APSB26-155 for parser-specific details.

Root Cause

The root cause is missing or incorrect bounds validation in a file-parsing routine. When a malformed structure specifies sizes or offsets outside the expected range, the application writes attacker-controlled bytes into unintended memory regions. This corrupts pointers, function tables, or object metadata used later during execution.

Attack Vector

The attack vector is local file opening. An attacker crafts a malicious Substance3D project or asset file and convinces a user to open it in Substance3D Modeler. No network exposure or elevated privileges are required. The exploitation chain typically involves social engineering through targeted email, compromised asset marketplaces, or supply chain distribution of trojanized project files.

No public proof-of-concept exploit is currently available, and the vulnerability is not listed in CISA KEV.

Detection Methods for CVE-2026-79906

Indicators of Compromise

Substance3D Modeler process (Adobe Substance 3D Modeler.exe) spawning unexpected child processes such as cmd.exe, powershell.exe, or bash
Unexpected outbound network connections originating from the Substance3D Modeler process
Crashes or abnormal terminations of Substance3D Modeler correlated with opening third-party asset files
New persistence artifacts (scheduled tasks, Run keys, LaunchAgents) created shortly after Substance3D Modeler activity

Detection Strategies

Monitor for anomalous child process creation from creative application executables
Alert on Substance3D Modeler writing executable content (.exe, .dll, .dylib, scripts) to user-writable directories
Correlate file-open telemetry against known-bad file hashes and threat intelligence for malicious 3D assets
Track process crashes for Substance3D Modeler as a signal of attempted exploitation

Monitoring Recommendations

Centralize endpoint process and file telemetry from workstations running Substance3D Modeler
Enable script-block and command-line logging on Windows to capture post-exploitation behavior
Baseline normal network egress from creative workstations to surface unusual command-and-control traffic
Review email and download logs for delivery of Substance3D project files from untrusted senders

How to Mitigate CVE-2026-79906

Immediate Actions Required

Apply the update referenced in Adobe security bulletin APSB26-155 to all systems running Substance3D Modeler
Inventory endpoints with Substance3D Modeler installed and prioritize patching for users who handle external assets
Instruct users to avoid opening Substance3D files from untrusted or unverified sources until patched
Restrict execution of Substance3D Modeler on systems that do not require it

Patch Information

Adobe released a security update through bulletin APSB26-155. Administrators should upgrade to the fixed version listed in the Adobe advisory using Adobe Creative Cloud or enterprise deployment tooling. Verify installed versions after deployment to confirm remediation.

Workarounds

Block delivery of Substance3D project files at the email gateway when senders are outside the organization
Enforce least-privilege user accounts so that any code executed inherits minimal rights
Use application allowlisting to prevent Substance3D Modeler from spawning shells or scripting hosts
Isolate creative workstations that handle third-party assets on a segmented network zone

bash

# Verify installed Substance3D Modeler version on macOS
defaults read "/Applications/Adobe Substance 3D Modeler.app/Contents/Info.plist" CFBundleShortVersionString

# Windows: query installed version via PowerShell
Get-ItemProperty HKLM:\Software\Microsoft\Windows\CurrentVersion\Uninstall\* |
  Where-Object { $_.DisplayName -like "*Substance 3D Modeler*" } |
  Select-Object DisplayName, DisplayVersion