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": "2026-08-25T18:17:53.583Z",
  "pubdate": "2026-08-25T18:17:53.583Z",
  "executiveSummary": "Substance3D - Sampler is susceptible to an out-of-bounds write vulnerability, a critical memory corruption flaw. This vulnerability allows for potential arbitrary code execution within the security context of the current user.\nThe vulnerability is triggered when a user opens a specifically crafted, malicious file using the software. Successful exploitation provides an attacker with the ability to execute arbitrary code on the host system without requiring prior authentication.\nThe impact of this vulnerability is significant, as it could lead to full compromise of the user's session, potential data theft, or further system infiltration. The necessity of user interaction in opening a malicious file is the primary barrier to exploitation.\nThis flaw underscores the importance of strict input validation when parsing complex file formats. Users are advised to avoid opening files from untrusted sources.",
  "technicalDetails": "The vulnerability is identified as an out-of-bounds (OOB) write, occurring when the application's file-parsing engine fails to properly validate the size or structure of data contained within a manipulated file. In scenarios involving complex file formats, parsers often allocate fixed-size memory buffers for specific data chunks. If an attacker crafts a malicious file containing oversized data or unexpected metadata fields that deviate from the expected protocol, the parser may write data past the designated boundary of the allocated buffer.\nThe root cause lies in improper bounds checking during the deserialization or processing of input data. When the application attempts to copy or write data into a buffer without verifying that the source data fits within the destination constraints, the memory corruption occurs. This uncontrolled write operation allows an attacker to overwrite adjacent memory structures, such as pointers, function return addresses, or objects stored on the heap or stack.\nThe attack flow begins when an attacker distributes a malicious file through social engineering, phishing, or other distribution channels. When the victim opens this file in Substance3D - Sampler, the vulnerable parsing routine is invoked. By carefully controlling the content written out-of-bounds, the attacker can hijack the control flow of the application. For example, by overwriting a function pointer or a return address, the attacker can redirect execution to a payload (e.g., shellcode) embedded within the malicious file or located elsewhere in memory.\nBecause the execution happens within the security context of the current user, any resulting payload operates with the same privileges as the application. Post-exploitation, the attacker may establish persistence, access sensitive files, or pivot to other components of the system. This vulnerability does not require remote authentication or elevated privileges, as the execution is client-side and driven by the application's standard operation upon file ingestion. The absence of adequate input sanitization allows the crafted file to bypass standard security checks, leading to a compromise of the application's memory space."
}