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CVE-2026-21363 is a NULL Pointer Dereference vulnerability affecting Adobe Substance 3D Painter versions 11.1.2 and earlier. The vulnerability exists within the application’s handling of specific file formats. When a user is tricked into opening a specially crafted malicious file, the application fails to properly validate a memory pointer before using it. If the file triggers a condition where the pointer expects a memory address but receives a NULL value, the software attempts to read or write to memory location zero. Operating systems protect this memory region, and such an illegal access operation forces the operating system to immediately terminate the offending process to prevent system corruption. This results in an unexpected crash of the Substance 3D Painter application. Since the vulnerability only affects the availability of the software and does not allow for code execution or data theft, it is classified as a Denial-of-Service (DoS) issue. The attack vector is local, requiring the attacker to deliver the file to the victim, and the victim to open it, making user interaction a prerequisite for successful exploitation.
dailycve form:
Platform: Adobe Substance 3D Painter
Version: 11.1.2 and earlier
Vulnerability : NULL Pointer Dereference
Severity: MEDIUM (CVSS 5.5)
date: March 10, 2026
Prediction: Patch released March 10, 2026
What Undercode Say:
Analytics:
CWE-476: NULL Pointer Dereference
Attack Vector: Local (AV:L)
User Interaction: Required (UI:R)
Impact Scope: Unchanged (S:U)
Technical Impact: Denial-of-Service (A:H)
Exploit:
This is a conceptual example of how a malformed file triggers the crash.
The vulnerability lies in how the application parses a specific header.
1. A malicious .spp file is crafted with a corrupted header block.
2. The application reads a pointer value from the file.
3. If the value is set to 0x00000000 (NULL), the application fails to check it.
4. The application attempts to execute: value = pointer;
5. This dereference of 0x00000000 causes an access violation.
Example code snippet of the vulnerable logic:
vulnerable_function() {
char data_pointer = read_pointer_from_file(malicious_file);
// Missing check: if (data_pointer == NULL) { return error; }
char first_byte = data_pointer[bash]; // CRASH HERE if data_pointer is NULL
}
Protection from this CVE:
Update to Substance 3D Painter version 11.1.3 or later.
Do not open .spp or related Substance files from untrusted sources.
Implement Group Policies to restrict software execution in sandboxed environments if untrusted files are handled.
Use endpoint detection and response (EDR) tools to monitor for application crashes and异常的 process behavior.
Impact:
Loss of Productivity: Unsaved work in the 3D painting application is lost.
Workflow Disruption: Artists and designers experience interruptions, halting creative pipelines.
Denial of Service: The application becomes unavailable until manually restarted by the user.
Repetitive Crashes: An attacker could repeatedly send the file to keep the software offline.
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Sources:
Reported By: nvd.nist.gov
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