Substance 3D Designer EUVD-2026-65629

Exploitation requires the victim to actively open a specially crafted file in Adobe Substance 3D Designer - this is the sole prerequisite. No authentication, no network-exposed service, and no special system configuration are required on the target machine beyond having Substance 3D Designer installed. The CVSS vector PR:N confirms the attacker requires no privileges on the target system; the attacker's only role is crafting and delivering the malicious file. Exploitation is limited by UI:R: the victim must be socially engineered or otherwise induced to open the file. Scope is unchanged (S:U), meaning exploitation is bounded to the privileges of the current user running Designer - typically a non-root desktop user, which limits lateral escalation unless combined with a privilege escalation chain.

The CVSS 7.8 score reflects a High-severity local file-parsing vulnerability with full C/I/A impact, but with a critical limiting factor: UI:R requires the victim to actively open a malicious file. In practice, this is a standard phishing or watering-hole delivery mechanism targeting 3D artists and designers. Attack complexity is low (AC:L), meaning no race conditions or unusual circumstances are required once the file is opened. No EPSS data was provided, and no KEV listing exists, so exploitation probability cannot be quantified beyond inference. No public POC has been identified at time of analysis. The realistic threat model involves targeted attacks against game studios, VFX houses, or film production companies - where sharing Designer project files over email, Slack, or asset management systems is routine workflow. This makes social engineering delivery highly plausible despite the UI:R gate. Risk is meaningful for organizations in creative industries but lower for general enterprise environments where Designer is not deployed.

An attacker crafts a malicious Substance 3D Designer project file (.sbs or similar) embedding a payload that triggers a heap-based buffer overflow during file parsing. The attacker delivers this file to a target - such as a game studio artist - via email, a shared asset repository, or a community file-sharing platform, using social engineering to convince the victim to open it. Upon opening the file in Substance 3D Designer, the overflow corrupts heap memory and redirects execution to attacker-controlled shellcode, running arbitrary commands as the logged-in user.