Description

Substance3D - Painter 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": "2026-08-25T18:18:03.970Z",
  "pubdate": "2026-08-25T18:18:03.970Z",
  "executiveSummary": "Substance3D - Painter is susceptible to a heap-based buffer overflow vulnerability, categorized as a critical memory safety flaw. This vulnerability arises from improper bounds checking when processing specific file formats within the application.\nSuccessful exploitation allows a remote attacker to achieve arbitrary code execution under the security context of the currently logged-in user. The primary risk implication is full system compromise within the user's privilege scope, as an attacker could execute malicious payloads, install persistent backdoors, or exfiltrate sensitive data.\nThe vulnerability is triggered by user interaction; an attacker must entice a victim to open a specially crafted, malicious file using Substance3D - Painter. Due to the nature of heap corruption, this flaw does not require prior authentication or network access to the target system, provided the file can be delivered to the end-user via standard vectors such as email, file sharing, or malicious downloads.\nThis represents a high-severity risk for creative environments where third-party asset ingestion is common, as the lack of effective input validation allows for memory corruption that bypasses standard application-level security controls.",
  "technicalDetails": "The vulnerability manifests as a heap-based buffer overflow in Substance3D - Painter, stemming from a failure to validate the length of input data provided within an external file before copying it into a pre-allocated heap memory buffer. In software architecture, heap-based overflows occur when an application allocates a fixed-size buffer on the heap and subsequently writes data that exceeds these bounds without adequate sanitization or boundary verification.\nThe attack flow begins when a user opens a maliciously crafted file designed to trigger the overflow condition. The file format likely contains data fields—such as headers, metadata, or geometry definitions—that specify a data size larger than the destination buffer capacity. When the vulnerable component parses these fields, it performs a copy operation using an insufficiently validated size parameter, resulting in the corruption of adjacent heap metadata or critical data structures.\nBy precisely controlling the contents of the overflow, an attacker can overwrite adjacent heap chunks, including object pointers, virtual function tables (vtable), or function pointers. Subsequent application logic attempting to use these corrupted pointers can be redirected to attacker-controlled memory segments. This redirection facilitates control over the program's execution flow, enabling the redirection of control flow to a malicious payload, such as a shellcode residing elsewhere in memory or a Return-Oriented Programming (ROP) chain.\nBecause the execution happens within the user's context, the payload inherits the effective permissions of the user running Substance3D - Painter. If the user possesses administrative or high-level privileges, the attacker gains equivalent control. Post-exploitation impact includes arbitrary code execution, which allows for unauthorized data access, the deployment of secondary malware, or the manipulation of the local file system. This vulnerability does not require authentication, as the attack is facilitated entirely through the processing of untrusted input. The lack of robust memory protection and input validation during the deserialization or parsing phase is the fundamental root cause, necessitating that the application implement strictly enforced bounds checking and utilize safer memory management practices during all file input operations."
}