Description

Substance3D - Sampler is affected by a Heap-based Buffer Overflow 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": "2026-08-25T18:17:53.880Z",
  "pubdate": "2026-08-25T18:17:53.880Z",
  "executiveSummary": "Substance3D Sampler is susceptible to a heap-based buffer overflow vulnerability, which poses a critical security risk to users of the software.\nThis vulnerability allows an attacker to execute arbitrary code within the security context of the currently logged-in user.\nThe flaw stems from improper memory handling when processing crafted input files.\nThe primary exploitation vector requires user interaction, specifically compelling a victim to open a maliciously formatted file within the application.\nIf successfully exploited, the vulnerability grants an attacker the ability to execute unauthorized instructions, potentially leading to full application compromise, data exfiltration, or further system infiltration depending on the user's privilege level.\nThis issue represents a significant risk to the integrity and confidentiality of the host environment, as it bypasses standard security controls through memory corruption.\nOrganizations using Substance3D Sampler should treat this as a high-priority threat, as memory corruption vulnerabilities of this nature are frequently leveraged for weaponized exploits.",
  "technicalDetails": "The vulnerability is identified as a heap-based buffer overflow occurring during the parsing process of specific file formats within Substance3D Sampler.\nThe root cause of this vulnerability lies in the application's failure to perform adequate boundary checks when allocating memory or writing data to the heap during the deserialization or rendering phase of a malicious file.\nWhen the software encounters a malformed input, it attempts to write data beyond the allocated buffer boundaries on the heap. This memory corruption allows an attacker to overwrite adjacent heap metadata, function pointers, or object structures.\nThe attack flow begins when an attacker crafts a malicious file containing oversized data payloads designed to trigger the overflow condition. The attacker delivers this file to a target user through common vectors such as email attachments, social engineering, or shared network resources.\nOnce the victim opens the file in Substance3D Sampler, the vulnerable parsing component processes the crafted input, triggering the overflow. By precisely controlling the overflow content, an attacker can hijack the application's control flow, redirecting execution to arbitrary shellcode or a ROP (Return-Oriented Programming) chain.\nSince the execution occurs within the context of the current user, the payload inherits all local permissions and file system access rights granted to that account. This bypasses typical user-mode security protections.\nThe exploitation does not require the attacker to have pre-existing authentication or local network exposure, provided they can facilitate the delivery and manual opening of the malicious file by the legitimate user.\nPost-exploitation, the attacker may establish persistence, access sensitive project files, capture keystrokes, or pivot into other segments of the local network through the compromised workstation.\nThe vulnerability is critical due to its ability to facilitate remote code execution (RCE) via common document-based attack patterns, making it a viable target for threat actors seeking to compromise workstations running graphics and design software."
}