Substance 3D Sampler CVE-2026-48420

Exploitation requires that the victim open a malicious file using an unpatched version of Adobe Substance 3D Sampler - no network service, daemon, or remotely reachable component is involved. The CVSS attack vector AV:L confirms that the attack is local and file-triggered, not network-delivered. UI:R confirms that victim interaction (opening the file) is mandatory; passive drive-by exploitation is not possible. PR:N on the attacker side means no credentials on the target system are needed by the attacker, but successful delivery of the file to the victim and convincing them to open it are required preconditions. Scope is unchanged (S:U), meaning exploitation is confined to the current user's privilege level - kernel or system-level compromise is not a direct outcome unless the user runs with elevated privileges. No non-default configuration setting or special feature-flag is described as necessary; the vulnerability appears to be present in the standard file-parsing code path.

The CVSS 3.1 score of 7.8 with vector AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H reflects a locally-triggered, file-based attack with full impact on confidentiality, integrity, and availability - but critically, no network reachability. The local attack vector materially reduces opportunistic exploitation risk: an adversary must deliver a malicious file to the victim through social engineering, phishing, or supply-chain file distribution, and the victim must actively open it. Low attack complexity (AC:L) means no race conditions or special timing is required once the file is opened. No EPSS score was provided in the intelligence data, so probabilistic exploitation likelihood cannot be quantified here. The vulnerability is not listed in the CISA KEV catalog, and no public POC has been identified, which together suggest this is not currently under active widespread exploitation. The tags 'Memory Corruption' and 'Buffer Overflow' are consistent with the CWE-787 root cause. Real-world risk is moderate for organizations whose creative or 3D production staff receive external asset files from third parties - a workflow that is routine in game development and VFX pipelines - making file-source hygiene the primary compensating control.

An attacker crafts a malicious Adobe Substance 3D Sampler project file that encodes out-of-bounds write conditions in its asset data structures, then delivers it to a target via phishing email, a poisoned asset marketplace listing, or a compromised file-sharing link. When the victim opens the file in an unpatched version of Substance 3D Sampler, the parser's out-of-bounds write corrupts memory in a manner that redirects execution to attacker-controlled code, running arbitrary commands in the victim's user context. No public proof-of-concept exploit has been identified in the provided data, so this scenario reflects the theoretical exploit path derived from the CVSS vector and CWE classification.