CVE-2026-103827: Substance3D Designer DoS Vulnerability

CVE-2026-103827 Overview

CVE-2026-103827 is a stack-based buffer overflow vulnerability [CWE-121] in Adobe Substance3D Designer. The flaw allows an attacker to crash the application, producing a denial-of-service condition. Exploitation requires user interaction: a victim must open a malicious file crafted by the attacker.

The vulnerability is local in scope and does not require authentication, but it depends on social engineering to deliver and open the malicious asset. Adobe documented the issue in security bulletin APSB26-169.

Critical Impact
An attacker who convinces a user to open a malicious Substance3D Designer file can trigger a stack overflow that crashes the application, disrupting 3D asset workflows and potentially corrupting unsaved work.

Affected Products

Adobe Substance3D Designer (see Adobe advisory APSB26-169 for affected build ranges)
Windows installations of Substance3D Designer
macOS installations of Substance3D Designer

Discovery Timeline

2026-10-13 - CVE-2026-103827 published to NVD
2026-10-14 - Last updated in NVD database

Technical Details for CVE-2026-103827

Vulnerability Analysis

The vulnerability is a stack-based buffer overflow classified under [CWE-121]. Substance3D Designer processes complex scene, material, and graph files containing structured binary and text data. When the application parses a malformed file, it writes attacker-controlled data past the bounds of a fixed-size stack buffer.

The overflow corrupts adjacent stack memory, including saved return addresses and frame pointers. The result is an unrecoverable application crash. The CVSS vector indicates the integrity and confidentiality impacts are absent, while availability is fully impacted. Code execution is not reported as part of this issue.

Exploitation is bounded by the requirement for user interaction. An attacker must deliver a weaponized project, material, or asset file and persuade the target to open it inside Substance3D Designer.

Root Cause

The root cause is missing or insufficient bounds checking on data read from a file into a stack-allocated buffer. The parser trusts a size field or terminator present in the input rather than validating it against the destination buffer length before copying.

Attack Vector

The attack vector is local and user-assisted. An attacker distributes a malicious Substance3D asset file through phishing, compromised asset repositories, or shared project archives. When the victim opens the file, the parser processes attacker-controlled fields and overflows the stack, terminating the application.

The vulnerability manifests during file parsing before any user-facing editing operations complete. See the Adobe Security Bulletin APSB26-169 for technical details.

Detection Methods for CVE-2026-103827

Indicators of Compromise

Repeated unexpected crashes of Adobe Substance 3D Designer.exe shortly after opening a project or material file
Windows Error Reporting (WER) or macOS crash reports referencing stack corruption or access violations in Substance3D Designer modules
Substance3D Designer asset files received from untrusted sources, especially via email attachments or unfamiliar asset marketplaces
Process termination events for Substance3D Designer correlated with recent file-open operations

Detection Strategies

Monitor endpoint telemetry for abnormal exit codes and crash signatures tied to the Substance3D Designer process.
Correlate file-write events in download directories with subsequent Substance3D Designer process launches and crashes.
Alert on Substance3D Designer project files originating from external email gateways or web downloads that are opened within a short window.

Monitoring Recommendations

Collect application crash telemetry from Windows and macOS endpoints running Substance3D Designer.
Track the installed version of Substance3D Designer across the fleet to confirm patch coverage.
Review mail and web proxy logs for inbound Substance3D asset files from untrusted senders.

How to Mitigate CVE-2026-103827

Immediate Actions Required

Apply the Substance3D Designer update listed in Adobe security bulletin APSB26-169 to all affected workstations.
Instruct users to open Substance3D asset files only from trusted internal repositories and verified vendors.
Quarantine Substance3D project files received from external or unverified sources until they can be inspected.

Patch Information

Adobe has released a fixed version of Substance3D Designer. Refer to the Adobe Security Bulletin APSB26-169 for the exact fixed build numbers and download instructions. Update all endpoints with Substance3D Designer installed to the patched release.

Workarounds

Restrict Substance3D Designer usage to users who require it, reducing the attack surface for malicious file delivery.
Block or flag inbound Substance3D project file types at email and web gateways when they originate from untrusted senders.
Enforce application sandboxing or least-privilege user accounts for workstations running Substance3D Designer so a crash cannot be chained into broader impact.

bash

# Configuration example
# Verify Substance3D Designer version on Windows after patching
"C:\Program Files\Adobe\Adobe Substance 3D Designer\Adobe Substance 3D Designer.exe" --version

# Verify Substance3D Designer version on macOS after patching
/Applications/Adobe\ Substance\ 3D\ Designer/Adobe\ Substance\ 3D\ Designer.app/Contents/MacOS/Adobe\ Substance\ 3D\ Designer --version