Description

Substance3D - Designer 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": "2026-08-25T18:17:54.473Z",
  "pubdate": "2026-08-25T18:17:54.473Z",
  "executiveSummary": "Substance3D Designer contains a critical out-of-bounds write vulnerability that exposes users to potential arbitrary code execution. This flaw resides in the file parsing or rendering logic of the application, triggered when a user opens a maliciously crafted file.\nThe vulnerability type is classified as an out-of-bounds write, which occurs when an application writes data past the intended boundary of a memory buffer. Successful exploitation allows an attacker to achieve code execution within the security context of the currently logged-in user.\nThe primary risk implication is the potential for full system compromise, data exfiltration, or the installation of persistent malicious software on the victim's host. Exploitation is contingent upon user interaction, specifically the opening of a malicious file provided by the attacker.\nNo authentication is required for exploitation; however, the attacker must entice the victim to interact with the weaponized file, making this a client-side execution vector. Due to the nature of the application, files are often shared within professional workflows, increasing the probability of successful social engineering.",
  "technicalDetails": "The vulnerability identified in Substance3D Designer is an out-of-bounds write resulting from improper validation of input file structures. When the application processes file formats, it relies on parsing routines that extract metadata, textures, or procedural definitions. If these routines fail to verify the size or bounds of input data before committing it to a pre-allocated memory buffer, an attacker can supply a malicious file that defines data structures exceeding the buffer's capacity.\nDuring the parsing process, the application likely performs a copy or write operation where the destination memory offset is calculated based on headers or embedded object sizes defined within the malicious file. By manipulating these headers, an attacker forces the write pointer to move outside the allocated memory region. This memory corruption allows for the overwriting of adjacent heap or stack metadata, function pointers, or return addresses.\nThe attack flow proceeds as follows: First, the attacker crafts a malicious file containing specific offsets or size fields designed to trigger the out-of-bounds condition. Second, the attacker distributes this file through social engineering or distribution channels. Third, when a user opens the file in Substance3D Designer, the application attempts to parse the malicious metadata. Fourth, the triggered write operation overwrites critical execution control structures within the application's memory space. Finally, the attacker gains control over the program's execution flow, redirecting it to a payload—typically shellcode or a return-oriented programming (ROP) chain—embedded within the malicious file.\nThis vulnerability is particularly dangerous because the exploitation happens within the context of the user process. Consequently, the attacker inherits the full permissions of the user, facilitating further system access or lateral movement within a corporate network. Since the issue occurs at the application layer during file ingestion, it bypasses traditional network-based firewalls, shifting the defense requirement to the application's internal input sanitization and memory management routines. The lack of robust bounds checking during file ingestion represents the root cause of the memory corruption."
}