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": "2026-08-25T18:18:03.817Z",
  "pubdate": "2026-08-25T18:18:03.817Z",
  "executiveSummary": "Substance3D Painter is susceptible to a heap-based buffer overflow vulnerability that allows for arbitrary code execution.\nThe vulnerability is triggered when the application parses a maliciously crafted file, requiring user interaction.\nImpact includes potential full system compromise within the security context of the logged-in user.\nThe attack is classified as a memory corruption issue, where improper boundary checks during file processing enable an attacker to overwrite sensitive memory structures on the heap.\nSuccessful exploitation grants the attacker the ability to execute arbitrary code, potentially leading to unauthorized data access, persistence, or lateral movement within the environment.\nNo authentication is required to initiate the attack; however, the victim must be induced to open the malicious file, making this a client-side exploitation scenario.",
  "technicalDetails": "The vulnerability manifests as a heap-based buffer overflow within the file parsing logic of Substance3D Painter. Heap-based buffer overflows occur when a program allocates a fixed-size buffer on the heap and subsequently writes data into that buffer without sufficient boundary validation. When the input provided by the malicious file exceeds the allocated memory segment, the process overwrites adjacent heap metadata or application data structures.\nThe root cause is likely an insufficient validation of length fields or indices within the file format implementation. When the application encounters a malformed or oversized input sequence during the parsing process, it fails to constrain the write operation to the boundaries of the heap buffer. This behavior leads to the corruption of neighboring memory chunks.\nThe attack flow begins when an attacker distributes a crafted file that embeds an exploit payload within the file structure. Upon the user opening this file within Substance3D Painter, the application's internal parsers attempt to process the file's data. If the parser is improperly handling the input, it triggers the heap overflow. By carefully crafting the malicious data, an attacker can manipulate heap metadata—such as chunk headers or pointers—to redirect the control flow of the application when the corrupted memory is subsequently accessed or deallocated.\nBy overwriting function pointers or object vtables residing on the heap, an attacker can achieve code execution. Upon gaining control of the instruction pointer, the attacker can redirect execution to a payload (e.g., shellcode) or utilize return-oriented programming (ROP) to bypass Data Execution Prevention (DEP) and execute malicious commands. Because the vulnerability is exploited in the context of the user running the application, the payload inherits the privileges of that user, enabling unrestricted access to the user's files and environmental data.\nThe attack does not require network exposure in the traditional sense, as the vector is file-based; however, it remains highly effective via social engineering tactics where the victim is convinced to open untrusted files. There are no authentication requirements to trigger the vulnerability, as the processing logic is executed upon the initialization of the file rendering process."
}