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": "2026-08-25T18:17:53.303Z",
  "pubdate": "2026-08-25T18:17:53.303Z",
  "executiveSummary": "Substance3D - Sampler contains an out-of-bounds write vulnerability that poses a critical security risk to users.\nThis vulnerability is classified as an out-of-bounds write, which occurs when an application writes data past the boundaries of an intended buffer.\nSuccessful exploitation of this flaw can result in arbitrary code execution within the context of the current user, granting the attacker the same permissions as the victim.\nThe vulnerability affects Substance3D - Sampler and is triggered when a user opens a specifically crafted, malicious file.\nThe requirement for user interaction constitutes a primary exploitation vector, where social engineering is likely necessary to induce a victim to open the file.\nDue to the nature of out-of-bounds write vulnerabilities, the risk of memory corruption leading to system compromise is high, necessitating immediate attention to security updates or containment strategies.",
  "technicalDetails": "The vulnerability resides in the way Substance3D - Sampler handles malformed data structures within certain file formats. An out-of-bounds write typically occurs when input parsing logic fails to properly validate the size of input data before performing memory write operations. In this context, the application likely utilizes a flawed boundary check or an incorrect calculation of buffer offsets when processing file metadata or proprietary data blobs.\nWhen a malicious file is opened, the parser attempts to write input data into a pre-allocated memory buffer. If the input is engineered to trigger the out-of-bounds condition, the software writes data into adjacent memory regions. This memory corruption can overwrite critical control structures, such as return addresses, function pointers, or objects containing virtual method tables (vtable).\nThe attack flow commences when a threat actor distributes a weaponized file to a target. Once the victim triggers the file in Substance3D - Sampler, the vulnerable parsing routine processes the malicious payload. By carefully controlling the overwritten data, an attacker can redirect the execution flow of the application to shellcode or existing executable memory (Return-Oriented Programming or ROP chains).\nBecause the vulnerability is triggered within the application process, the resulting arbitrary code execution inherits the privilege level of the current user session. This means that if the user has administrative or elevated rights, the attacker gains full control over the process or the local environment. The absence of specific exploitation requirements such as network exposure or authentication is notable; the attack surface is entirely local, dependent only on the user interaction of opening the file. The post-exploitation impact includes persistent compromise, data exfiltration, or the deployment of further malicious software payloads, as the attacker can interact with the system using the victim's application context."
}