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high advisory

CVE-2026-34676: Adobe Substance3D Painter Out-of-bounds Write Vulnerability

Adobe Substance3D Painter versions 12.0.2 and earlier are vulnerable to an out-of-bounds write, potentially leading to arbitrary code execution if a user opens a malicious file.

CVE-2026-34676 describes an out-of-bounds write vulnerability affecting Adobe Substance3D Painter versions 12.0.2 and earlier. This vulnerability can lead to arbitrary code execution within the context of the current user. The attack requires user interaction, as the victim must open a specially crafted malicious file. Successful exploitation could allow an attacker to gain control of the user’s system. This vulnerability was reported by Adobe Systems Incorporated and assigned a CVSS v3.1 score of 7.8.

Attack Chain

  1. Attacker crafts a malicious Substance3D Painter file.
  2. The attacker delivers the malicious file to a victim. This could be done through phishing, social engineering, or other methods.
  3. The victim opens the malicious file using an affected version of Substance3D Painter (<= 12.0.2).
  4. Substance3D Painter attempts to process the malicious file.
  5. Due to the out-of-bounds write vulnerability, the application writes data to an unintended memory location.
  6. This write overwrites critical program data or code.
  7. The attacker gains the ability to execute arbitrary code in the context of the user.
  8. The attacker can then perform actions such as installing malware, stealing data, or gaining persistent access to the system.

Impact

Successful exploitation of CVE-2026-34676 can result in arbitrary code execution on the victim’s machine, with the privileges of the user running Substance3D Painter. This could lead to data theft, malware installation, or complete system compromise. The vulnerability requires user interaction, limiting the scope of potential attacks. However, targeted attacks could be highly effective if victims can be tricked into opening malicious files.

Recommendation

  • Upgrade to a version of Substance3D Painter that addresses CVE-2026-34676. Refer to the Adobe security advisory https://helpx.adobe.com/security/products/substance3d_painter/apsb26-55.html for specific instructions.
  • Deploy the Sigma rule to detect suspicious process executions originating from Substance3D Painter after a file open operation.
  • Educate users to be cautious when opening files from untrusted sources, as this vulnerability requires user interaction.

Detection coverage 2

Detects CVE-2026-34676 Exploitation — Suspicious Child Processes of Substance3D Painter

high

Detects CVE-2026-34676 exploitation — monitors for suspicious processes spawned by Substance3D Painter after a file open operation, which may indicate successful code execution via a crafted file.

sigma tactics: execution techniques: T1053.005, T1059.001, T1202 sources: process_creation, windows

Detects CVE-2026-34676 Attempt - Network Connection from Unusual Painter Process

medium

Detects CVE-2026-34676 attempt — monitors for network connections initiated by unusually named or located processes associated with Substance3D Painter, possibly indicating code execution.

sigma tactics: command_and_control techniques: T1071.001 sources: network_connection, windows

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