CVE-2026-71564: 
Adobe Substance 3D Designer vulnerability analysis and mitigation

CVE-2026-71564 is an out-of-bounds write vulnerability (CWE-787) in Adobe Substance 3D Designer that can result in arbitrary code execution in the context of the current user. It affects Adobe Substance 3D Designer version 16.0.4 and all earlier versions on all platforms. The vulnerability was disclosed and patched on August 25, 2026. It carries a CVSS v3.1 base score of 7.8 (High) (Adobe Advisory, GitHub Advisory).

The vulnerability is classified as CWE-787 (Out-of-bounds Write), meaning the application writes data beyond the boundaries of an allocated buffer during file parsing. The attack vector is local, requiring a victim to open a specially crafted malicious file — such as a Substance Designer project file — which triggers the out-of-bounds write condition. No privileges are required on the part of the attacker, but user interaction is mandatory. No public proof-of-concept or detailed technical write-up has been identified at this time (Adobe Advisory, GitHub Advisory).

Successful exploitation allows an attacker to execute arbitrary code with the privileges of the user running Adobe Substance 3D Designer, resulting in high confidentiality, integrity, and availability impact. This could lead to unauthorized access to sensitive design assets, modification or destruction of project files, and potential further compromise of the local system. The scope is limited to the affected application's security context and does not extend to other components (Adobe Advisory, GitHub Advisory).

There is no evidence of active in-the-wild exploitation or a publicly available proof-of-concept exploit as of the time of disclosure. The NVD SSVC assessment classifies exploitation as "none" and the attack as not automatable, reflecting the requirement for user interaction. The EPSS score is approximately 0.158%, indicating a low near-term probability of exploitation. The vulnerability has not been added to the CISA Known Exploited Vulnerabilities (KEV) catalog (Adobe Advisory, GitHub Advisory).

1. Craft a malicious file: An attacker creates a specially crafted Adobe Substance 3D Designer project file (e.g., .sbs or related format) that contains malformed data designed to trigger an out-of-bounds write during parsing.
2. Deliver the file: The attacker distributes the malicious file to a target user via phishing email, file-sharing platform, or social engineering, disguising it as a legitimate design asset.
3. Victim opens the file: The target user opens the malicious file in Adobe Substance 3D Designer version 16.0.4 or earlier.
4. Trigger out-of-bounds write: The application's file parser writes data beyond the intended buffer boundary, corrupting adjacent memory.
5. Achieve code execution: The memory corruption is leveraged to redirect execution flow, resulting in arbitrary code execution in the context of the current user's privileges (Adobe Advisory, GitHub Advisory).

• File System: Unexpected files written to user-accessible directories (e.g., temp folders, AppData) following the opening of a Substance Designer project file; presence of unknown executables or scripts created around the time a .sbs file was opened.
• Process: Unusual child processes spawned by the Adobe Substance 3D Designer process (e.g., cmd.exe, powershell.exe, sh, curl, or other system utilities).
• Logs: Application crash logs or Windows Event Logs indicating memory access violations or abnormal termination of the Substance 3D Designer process prior to or during exploitation.
• Network: Unexpected outbound network connections originating from the Substance 3D Designer process to unknown external IP addresses or domains.

Adobe has released version 16.0.5 of Substance 3D Designer to address this vulnerability; users should update immediately via the Creative Cloud desktop application or Adobe's official download channels. As an interim measure, users should avoid opening Substance 3D Designer project files received from untrusted or unknown sources. Organizations may also consider implementing file sandboxing or restricting the application's network access to limit the impact of potential exploitation (Adobe Advisory).

The vulnerability received routine coverage from security aggregators including AUSCERT (ESB-2026.10021), VulDB, and RedPacketSecurity on Mastodon shortly after disclosure. CISA included it in its weekly vulnerability bulletin (SB26-243). No notable independent researcher commentary or significant community discussion has been identified beyond standard advisory republication.