CVE-2026-103842 in Substance 3D Stager
Summary
by MITRE • 10/13/2026
Substance3D - Stager is affected by an out-of-bounds read vulnerability when parsing a crafted file, which could result in a read past the end of an allocated memory structure. An attacker could leverage this vulnerability to execute code 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 • 10/13/2026
The identified vulnerability resides within Substance3D Stager, specifically affecting its file parsing mechanisms. This flaw is classified as an out-of-bounds read, which corresponds to CWE-125: Out-of-bounds Read in standard security taxonomies. The root cause of this issue lies in the improper validation or boundary checking performed by the application when processing specific input files. When a crafted file containing malformed data structures is parsed, the software fails to correctly verify that memory access operations remain within the allocated bounds of the buffer. Consequently, the parser attempts to read from memory locations that lie beyond the end of the intended allocation structure. This type of error typically occurs due to incorrect arithmetic calculations regarding array indices or pointer offsets during the deserialization or parsing phase of file handling routines.
From an operational perspective, this vulnerability poses a significant risk because it can lead to more severe consequences than simple data leakage. While out-of-bounds reads are often associated with information disclosure, in complex parsers like those found in 3D modeling and staging tools, they can frequently be leveraged for arbitrary code execution. By carefully crafting the input file, an attacker may manipulate memory layout or trigger specific control flow paths that allow them to execute malicious instructions within the context of the currently logged-in user. This capability transforms a seemingly benign parsing error into a critical remote code execution vector, provided the victim interacts with the payload. The impact includes potential compromise of system integrity, confidentiality, and availability depending on the privileges held by the application at runtime.
The exploitation of this vulnerability is not entirely automatic as it requires user interaction. Specifically, a victim must open or load the malicious file within Substance3D Stager. This requirement aligns with common attack patterns observed in social engineering scenarios where users are tricked into opening seemingly legitimate but compromised project files. In terms of tactical classification, this behavior maps to ATT&CK technique T1204: User Execution, as it relies on the user initiating the execution context by interacting with a malicious file. The attacker must deliver the crafted payload through channels such as email attachments, shared network drives, or direct transfer mechanisms that prompt the victim to open the file in the vulnerable application.
To mitigate this risk, immediate patching is essential. Users should update Substance3D Stager to the latest version released by Adobe, which includes fixes for these memory safety issues alongside other security hardening measures. In environments where automatic updates are not feasible, administrators should implement strict input validation policies and restrict file types that can be opened within the application if possible. Additionally, deploying endpoint detection and response solutions with behavioral monitoring capabilities can help identify anomalous processes attempting to exploit parsing vulnerabilities by spawning unexpected child processes or accessing sensitive memory regions. Security awareness training for users is also critical to reduce the likelihood of successful social engineering attacks that lead to opening malicious files. Regular audits of third-party software dependencies used within the application stack may further uncover similar latent issues before they can be exploited in production environments.