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": "2026-08-25T18:17:53.450Z",
  "pubdate": "2026-08-25T18:17:53.450Z",
  "executiveSummary": "Substance3D - Sampler contains an out-of-bounds write vulnerability that poses a critical security risk to end users.\nThis vulnerability exists due to improper memory handling during the processing of specially crafted files, potentially leading to memory corruption.\nSuccessful exploitation of this flaw allows a remote attacker to achieve arbitrary code execution within the security context of the user executing the application.\nThe attack vector is dependent on user interaction, requiring the victim to open a maliciously engineered file using the affected software.\nExploitation does not require authentication or elevated privileges beyond those of the current user, making it an effective entry point for malicious actors.\nThe resulting impact includes full system compromise or unauthorized access to user data if the application is run by a user with sufficient system permissions.",
  "technicalDetails": "The vulnerability is classified as an out-of-bounds (OOB) write, which occurs when the software performs a write operation outside the intended boundaries of a memory buffer.\nIn the context of Substance3D - Sampler, the flaw originates from the application's file parsing engine failing to correctly validate the dimensions or metadata of input data structures.\nWhen a user opens a maliciously crafted file, the parser likely attempts to write incoming data into a heap-allocated buffer. Due to a lack of bounds checking, the application writes data past the end of the allocated memory segment.\nBy carefully crafting the malicious file, an attacker can overwrite adjacent memory structures, such as pointers, object metadata, or return addresses on the stack.\nThe exploitation flow typically begins with the delivery of the malicious file to the target. Once the victim triggers the file in Substance3D - Sampler, the application's parsing function fails to constrain the write operation to the pre-allocated buffer size.\nThis OOB write allows the attacker to corrupt the execution flow, often leading to a controlled crash or, more critically, the diversion of control flow to attacker-supplied shellcode or existing application code (Return Oriented Programming - ROP).\nBecause the execution occurs within the context of the current user, the attacker inherits all the permissions and access rights associated with that user session. This includes the ability to read, modify, or delete files, capture keystrokes, or establish persistent backdoors on the local machine.\nThere is no requirement for network-based authentication, as the attack is local to the victim's machine once the file is processed. The vulnerability exists entirely within the client-side parsing logic, effectively turning the file format itself into the weaponized payload.\nPost-exploitation activities are limited only by the privileges of the victim, making this a significant threat to user privacy and system integrity."
}