CVE-2026-48421 in Substance 3D Sampler
Summary
by MITRE • 08/25/2026
Substance3D - Sampler 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.
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Analysis
by VulDB Data Team • 08/25/2026
The identified vulnerability within Substance 3D Sampler represents a critical security flaw classified as an out-of-bounds write, which falls under the Common Weakness Enumeration category CWE-787. This type of memory corruption error occurs when software writes data to a memory location beyond the intended buffer boundaries, potentially overwriting adjacent memory structures such as function pointers or exception handlers. In the context of Adobe Substance 3D Sampler, this flaw is triggered specifically during the processing of maliciously crafted files designed to exploit the application's file parsing logic. The vulnerability allows an attacker to manipulate the internal state of the application by corrupting critical data structures in memory, thereby gaining control over the program flow and potentially executing arbitrary code within the security context of the currently logged-in user.
From a technical perspective, out-of-bounds write vulnerabilities are particularly dangerous because they provide a reliable mechanism for achieving remote code execution without requiring elevated privileges on the underlying operating system. When an application fails to properly validate input data before writing it into allocated memory buffers, an attacker can craft a payload that exceeds the buffer size and spills over into adjacent memory regions. This overflow can be leveraged to overwrite return addresses or function pointers with shellcode or other malicious instructions. The exploitation of this specific vulnerability in Substance 3D Sampler requires user interaction, as indicated by the requirement for the victim to open a malicious file. This aligns with typical attack vectors where social engineering is used to trick users into loading compromised assets, such as textures, materials, or project files that contain the exploit code embedded within their structure.
The operational impact of this vulnerability is severe, as successful exploitation leads to arbitrary code execution in the context of the current user. This means that if a victim opens a malicious file while running Substance 3D Sampler with standard user privileges, an attacker could gain access to sensitive files stored on the local system, install additional malware, or use the compromised application as a pivot point for further network attacks. Even though the execution is limited to the current user's permissions, this can still result in significant data loss, privacy violations, and potential escalation of privilege if other vulnerabilities are present in the operating system or related software components. The requirement for user interaction does not mitigate the severity significantly, as phishing campaigns and malicious file distribution remain prevalent threat vectors in professional environments where creative tools like Substance 3D Sampler are commonly used.
To align with industry standards such as MITRE ATT&CK, this vulnerability can be associated with techniques involving executable code injection or memory corruption exploitation, often categorized under initial access or execution tactics depending on the stage of the attack lifecycle. Defense-in-depth strategies should include keeping Adobe software updated to ensure that patches for known buffer overflow issues are applied promptly. Users must exercise caution when opening files from untrusted sources and consider using sandboxed environments or virtual machines for processing potentially suspicious assets. Additionally, enabling application control policies and leveraging endpoint detection and response solutions can help mitigate the risk of successful exploitation by detecting anomalous memory access patterns or unauthorized code execution attempts associated with such vulnerabilities.