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": "2026-08-25T18:17:53.160Z",
  "pubdate": "2026-08-25T18:17:53.160Z",
  "executiveSummary": "Substance3D - Sampler contains an out-of-bounds write vulnerability that poses a critical security risk to users.\nThe vulnerability is classified as an out-of-bounds write, which occurs when software performs an operation at an index outside the bounds of the intended memory buffer.\nSuccessful exploitation allows for arbitrary code execution in the security context of the current user.\nThe vulnerability affects Substance3D - Sampler.\nExploitation requires user interaction, specifically mandating that a victim opens a specially crafted, malicious file within the application.\nIf exploited, an attacker can gain the same privileges as the logged-in user, potentially leading to unauthorized data access, system compromise, or further malicious activity within the local environment.",
  "technicalDetails": "The identified vulnerability is an out-of-bounds write within the Substance3D - Sampler application, which arises during the parsing or processing of input files.\nAn out-of-bounds write vulnerability occurs when an application writes data past the end, or before the beginning, of the intended buffer. This typically happens due to insufficient validation of input data length or improper indexing calculations during memory operations.\nIn the context of Substance3D - Sampler, the vulnerable component resides in the file parsing logic used to handle specific file formats. When the application attempts to process a malicious file containing crafted metadata or structural elements, it fails to verify that the incoming data fits within the allocated memory buffer.\nThe exploitation flow begins with the delivery of a malicious file to the target user. When the user opens this file using Substance3D - Sampler, the application's file parser reads the malicious structure. Due to the lack of bounds checking, the parser writes the attacker-supplied data outside the intended buffer. This action allows an attacker to overwrite adjacent memory, including sensitive structures such as function pointers, return addresses on the stack, or object vtables.\nBy carefully crafting the contents of the malicious file, an attacker can hijack the application's control flow. By overwriting function pointers or return addresses with the address of attacker-supplied shellcode or by utilizing techniques such as Return-Oriented Programming (ROP), the attacker can force the application to execute arbitrary code.\nThe execution of the injected code occurs within the security context of the user running the Substance3D - Sampler application. Consequently, the malicious payload possesses the same permissions as the user, enabling the attacker to access files, install persistence mechanisms, or compromise other applications running under the same user's account.\nThis vulnerability does not require prior authentication or elevated privileges, as the impact is confined to the user session that triggers the vulnerability. The attack vector is localized, requiring the file to be processed locally, which effectively bypasses network-based perimeter defenses that are not inspecting file-level content."
}