CVE-2026-75769: Substance3D Painter RCE Vulnerability

CVE-2026-75769 Overview

Adobe Substance3D Painter contains a heap-based buffer overflow vulnerability that allows arbitrary code execution in the context of the current user. Exploitation requires a victim to open a malicious file crafted by an attacker. The flaw is categorized under [CWE-122] Heap-based Buffer Overflow and impacts local users interacting with untrusted project or asset files. Adobe published the issue in security advisory APSB26-129.

Critical Impact
Successful exploitation lets an attacker execute arbitrary code with the privileges of the logged-in user, potentially leading to full workstation compromise on artist and design workflows.

Affected Products

Adobe Substance3D Painter (versions identified in Adobe Security Advisory APSB26-129)
Windows installations of Substance3D Painter
macOS installations of Substance3D Painter

Discovery Timeline

2026-08-25 - CVE-2026-75769 published to the National Vulnerability Database
2026-08-26 - Last updated in NVD database

Technical Details for CVE-2026-75769

Vulnerability Analysis

The vulnerability is a heap-based buffer overflow [CWE-122] in Adobe Substance3D Painter. Substance3D Painter parses a variety of complex file formats, including textures, meshes, and project files. Improper validation of length or size fields during parsing allows attacker-controlled data to write past the bounds of an allocated heap buffer.

Overflowing heap memory can corrupt adjacent chunk metadata, function pointers, or C++ virtual table pointers. An attacker who controls the overwritten data can hijack program control flow and execute arbitrary code. Because the process runs with the current user's privileges, code execution grants access to any data and resources the user can reach.

Exploitation requires user interaction. The victim must open a malicious file supplied through phishing, a shared project, or a compromised asset marketplace. No network exposure is required, which limits mass exploitation but keeps targeted attacks against creative professionals viable.

Root Cause

The root cause is insufficient bounds checking when parsing structured input from a file. Substance3D Painter allocates a heap buffer sized from untrusted metadata, then copies content into it without validating that the copy length remains within the allocation. This mismatch between declared and actual sizes enables the overflow.

Attack Vector

The attack vector is local and requires user interaction. An attacker delivers a crafted Substance3D project or asset file. When the victim opens the file in Substance3D Painter, the parser triggers the overflow and executes attacker-supplied shellcode or ROP chains in the user's session.

No verified public exploit code is available for this vulnerability. Refer to the Adobe Security Advisory APSB26-129 for vendor technical details.

Detection Methods for CVE-2026-75769

Indicators of Compromise

Unexpected child processes spawned by Substance3D Painter.exe or the macOS equivalent, particularly command shells, scripting hosts, or LOLBins.
Substance3D Painter processes performing outbound network connections to unfamiliar hosts shortly after a file is opened.
Crash dumps or Windows Error Reporting entries referencing heap corruption inside Substance3D Painter modules.
Newly written executables, DLLs, or scheduled tasks created by the Substance3D Painter process tree.

Detection Strategies

Monitor process creation events where Substance3D Painter is the parent of interpreters such as powershell.exe, cmd.exe, wscript.exe, or bash.
Correlate file-open events for .spp, .sbsar, .sbs, and related asset formats with subsequent anomalous child processes or memory allocations.
Alert on Substance3D Painter loading unsigned or unusual DLLs from user-writable directories.

Monitoring Recommendations

Ingest endpoint process, file, and network telemetry from workstations running Substance3D Painter into a centralized analytics platform.
Track inbound file transfers of Substance3D assets from external email, chat, or web downloads for later correlation with execution events.
Baseline normal Substance3D Painter behavior on creative endpoints so that outliers such as network beacons or credential access attempts surface quickly.

How to Mitigate CVE-2026-75769

Immediate Actions Required

Apply the fixed version of Adobe Substance3D Painter listed in Adobe Security Advisory APSB26-129 on all endpoints.
Instruct users to open Substance3D project and asset files only from trusted sources and verified collaborators.
Inventory workstations with Substance3D Painter installed and prioritize patching for internet-facing or high-value creative teams.

Patch Information

Adobe has released updated versions of Substance3D Painter that address CVE-2026-75769. Consult the Adobe Security Advisory APSB26-129 for the specific fixed builds and download links for each supported platform.

Workarounds

Restrict opening of Substance3D project and asset files received from untrusted or external sources until patching is complete.
Run Substance3D Painter under a standard user account without local administrator rights to limit post-exploitation impact.
Use application allowlisting or endpoint controls to block Substance3D Painter from launching child processes such as command interpreters.

bash

# Configuration example: enumerate installed Substance3D Painter versions on Windows endpoints
Get-ItemProperty "HKLM:\Software\Microsoft\Windows\CurrentVersion\Uninstall\*" |
  Where-Object { $_.DisplayName -like "*Substance 3D Painter*" } |
  Select-Object DisplayName, DisplayVersion, InstallLocation