CVE-2026-75766 in Substance 3D Painter
Summary
by MITRE • 08/25/2026
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.
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Analysis
by VulDB Data Team • 08/25/2026
The identified vulnerability represents a critical security flaw within Substance 3D Painter, specifically manifesting as a heap-based buffer overflow condition. This type of memory corruption error occurs when the application writes data beyond the allocated boundaries of a dynamically allocated block on the computer's heap. In the context of modern software architecture, particularly for complex graphics and texture editing tools like Substance 3D Painter, handling external assets such as project files or imported textures involves parsing binary or structured data formats. If the parser fails to adequately validate the length or size parameters associated with incoming data structures before copying them into memory buffers, it allows an attacker to overwrite adjacent memory locations. This overwriting capability is particularly dangerous because heap metadata and function pointers often reside in close proximity to allocated buffers, providing a direct pathway for control flow hijacking if the overflow targets these critical areas.
The operational impact of this vulnerability is severe due to its potential to lead to arbitrary code execution within the context of the currently logged-in user. Unlike vulnerabilities that require elevated privileges or system-wide access, heap-based buffer overflows in application-level software can often be exploited with minimal prerequisites, provided the victim interacts with a malicious payload. In this specific scenario, exploitation necessitates user interaction, meaning an attacker must trick a target into opening a specially crafted file designed to trigger the overflow condition upon parsing. Once triggered, if successful, the exploit allows for the execution of arbitrary machine code on the affected system. This could result in complete compromise of the workstation, including theft of sensitive intellectual property such as 3D models and textures stored locally, installation of additional malware payloads, or use of the compromised machine as a pivot point within an internal network.
From a classification perspective, this vulnerability aligns with Common Weakness Enumeration (CWE) identifiers for memory safety violations. Specifically, it falls under CWE-122: Heap-based Buffer Overflow, which describes writing data past the end of a heap buffer. The exploitation technique leverages principles associated with CWE-787 and potentially CWE-416 if use-after-free conditions are involved in the exploit chain to stabilize memory state before code execution. In terms of adversary tactics, this vulnerability maps directly to MITRE ATT&CK techniques related to initial access via spearphishing attachment or drive-by compromise, specifically T1203: Exploitation for Client Execution. The requirement for user interaction places it within the domain of social engineering-dependent attacks where trust in file sources is exploited.
Mitigation strategies must address both immediate remediation and long-term defensive posture improvements. The primary defense is to apply vendor-provided patches or updates that correct the input validation logic, ensuring that all buffer sizes are strictly checked against allocated memory limits before data transfer occurs. Organizations should enforce strict software update policies to ensure Substance 3D Painter remains at its latest stable version with security fixes applied. Additionally, implementing application whitelisting can prevent unauthorized executables from running if code execution is achieved. Network segmentation and endpoint detection and response (EDR) solutions configured to monitor for anomalous memory access patterns or suspicious process creation following file opens can provide an additional layer of defense against exploitation attempts. User awareness training should also be conducted to emphasize the risks associated with opening files from untrusted sources, reinforcing the necessity of verifying file integrity before interaction.