CVE-2026-16783: 
Autodesk 3ds Max vulnerability analysis and mitigation

CVE-2026-16783 is an Out-of-Bounds Write vulnerability in Autodesk 3ds Max triggered by parsing a maliciously crafted ABC file. It affects Autodesk 3ds Max versions 2026.0.0 through 2026.3.4 (exclusive) and 2027.0.0 through 2027.2.0 (exclusive). The vulnerability was published on August 24, 2026, and carries a CVSS v3.1 base score of 7.8 (High), assigned by Autodesk (GitHub Advisory, Autodesk Advisory).

The root cause is an Out-of-Bounds Write (CWE-787) in 3ds Max's ABC file parser, where insufficient bounds checking allows a specially crafted ABC file to write data beyond the boundaries of an allocated buffer. The attack vector is local, requiring no privileges but necessitating user interaction — specifically, a victim must open the malicious ABC file within 3ds Max. Exploitation relies on social engineering to deliver the crafted file to a target user, after which the parser processes the malformed data and triggers the memory corruption (GitHub Advisory, Autodesk Advisory).

Successful exploitation can result in application crashes (denial of service), data corruption, or arbitrary code execution within the context of the current 3ds Max process. Because the code executes under the privileges of the logged-in user, an attacker could access sensitive files, install malware, or use the compromised workstation as a pivot point for further lateral movement within a network. The high confidentiality, integrity, and availability impact ratings reflect the full compromise potential of the affected process (GitHub Advisory, Autodesk Advisory).

There is no known public proof-of-concept exploit and no evidence of in-the-wild exploitation at this time (GitHub Advisory). The EPSS score is 0.0, indicating a very low current probability of exploitation in the wild. The vulnerability is not listed in the CISA Known Exploited Vulnerabilities (KEV) catalog. No threat actor attribution has been reported.

1. Craft malicious ABC file: An attacker creates a specially crafted Alembic (.abc) file containing malformed data designed to trigger an out-of-bounds write when parsed by Autodesk 3ds Max's ABC file parser.
2. Deliver the file: The attacker distributes the malicious ABC file to a target user via email attachment, file-sharing platform, or a compromised asset repository — leveraging social engineering to make the file appear legitimate (e.g., a 3D model asset).
3. Victim opens the file: The target user opens the crafted ABC file in a vulnerable version of Autodesk 3ds Max (2026.x < 2026.3.4 or 2027.x < 2027.2.0).
4. Trigger out-of-bounds write: The ABC parser processes the malformed file, writing data beyond the intended buffer boundary, corrupting adjacent memory.
5. Achieve code execution: If the memory corruption is exploited successfully, the attacker's payload executes arbitrary code in the context of the 3ds Max process, potentially enabling persistence, data exfiltration, or further lateral movement (GitHub Advisory, Autodesk Advisory).

• File System: Unexpected ABC files received from external or unknown sources in project directories; newly created or modified executable files or scripts in the 3ds Max installation or user profile directories following file parsing.
• Process: Unusual child processes spawned by the 3ds Max process (e.g., cmd.exe, powershell.exe, curl, wget) that are not part of normal application behavior; 3ds Max process crashing unexpectedly after opening an ABC file.
• Logs: Windows Event Logs showing application crashes (Event ID 1000/1001) associated with the 3ds Max executable; unexpected network connections originating from the 3ds Max process.
• Network: Outbound connections from the 3ds Max process to unknown or suspicious external IP addresses or domains following file open events.

Autodesk has released patched versions addressing this vulnerability: users should update to 3ds Max 2026.3.4 or later for the 2026 branch, and 3ds Max 2027.2.0 or later for the 2027 branch. As interim mitigations, users should avoid opening ABC files from untrusted or unknown sources, and organizations should educate staff about the risks of opening unsolicited 3D asset files. Additional hardening measures include implementing application sandboxing for file parsing operations and restricting file handling capabilities where feasible (Autodesk Advisory, GitHub Advisory).