Description

Substance3D - Sampler is affected by an out-of-bounds write vulnerability that could result in arbitrary code execution in the context of the current user. Exploitation of this issue requires user interaction in that a victim must open a malicious file.

Executive Summary

Technical Details

Mitigations

References

Additional Metadata

{
  "score": "7.8",
  "pubDate": "2026-08-25T18:18:00.477Z",
  "pubdate": "2026-08-25T18:18:00.477Z",
  "executiveSummary": "Substance3D Sampler is susceptible to an out-of-bounds write vulnerability that poses a critical risk to user security. This vulnerability originates from improper memory handling within the application when processing specific file formats. Successful exploitation allows an attacker to achieve arbitrary code execution within the security context of the current user.\nThe vulnerability is triggered by a malicious file crafted by an attacker, which must be opened by a victim within the Substance3D Sampler environment. As such, the attack requires user interaction. If compromised, an attacker gains the ability to execute arbitrary commands, potentially leading to unauthorized data access, system modification, or further lateral movement within the network. Because the malicious code runs under the victim's privileges, the scope of the impact is directly correlated to the user's local permissions on the affected system.",
  "technicalDetails": "The vulnerability is classified as an out-of-bounds write, stemming from the application's failure to properly validate input data length or buffer boundaries when parsing files within Substance3D Sampler. When the application processes a specially crafted malicious file, it attempts to write data beyond the allocated buffer boundaries in memory. This error typically occurs during the deserialization or parsing phase of file loading, where the application does not adequately verify the size of the incoming data against the destination buffer size.\nThe exploitation flow begins when an attacker distributes a weaponized file to a target. Once the victim is coerced or inadvertently prompted to open the malicious file using Substance3D Sampler, the application initiates its parsing routine. The flawed component within the application reads the file structure and triggers the out-of-bounds write operation. By carefully structuring the data within the malicious file, an attacker can overwrite adjacent memory structures, such as pointers, function addresses, or other critical data objects.\nThis overwrite provides a primitive for memory corruption, which the attacker can leverage to redirect the application's execution flow. By hijacking control flow, the attacker can redirect the instruction pointer to arbitrary executable code, often referred to as shellcode, embedded within the malicious file or placed in memory through heap spraying techniques. Since the application does not require authentication or specific elevated privileges to load these files, the attack surface is exposed to any user capable of opening a file with the application. The resulting arbitrary code execution occurs with the same privileges as the user running Substance3D Sampler. Post-exploitation, the attacker can execute commands, install persistence mechanisms, exfiltrate sensitive project files, or utilize the compromised workstation as a pivot point for broader network compromise. The lack of robust input boundary enforcement in the file handling mechanism remains the primary technical failure."
}