CVE-2026-103827: 
Adobe Substance 3D Designer vulnerability analysis and mitigation

CVE-2026-103827 is a Stack-based Buffer Overflow vulnerability (CWE-121) in Adobe Substance3D - Designer that can result in an application denial-of-service. An attacker can exploit this vulnerability to crash the application by inducing a victim to open a specially crafted malicious file. The vulnerability affects Substance 3D Designer versions 16.0.4 and prior; version 16.0.7 is unaffected. It was published on October 13, 2026, with a patch made available the same day. The CVSS v3.1 base score is 5.5 (Medium) (GitHub Advisory, Adobe Advisory).

The vulnerability is classified as CWE-121 (Stack-based Buffer Overflow), occurring when Substance 3D Designer processes a maliciously crafted file that causes a stack buffer to be overwritten beyond its allocated bounds. The attack vector is local (AV:L), requiring no privileges (PR:N) but necessitating user interaction — specifically, a victim must open a malicious file. The low attack complexity (AC:L) suggests the overflow condition is reliably triggered without special conditions once the file is opened. No public proof-of-concept or technical write-up detailing the specific file format or parsing routine involved has been identified (GitHub Advisory, Adobe Advisory).

Successful exploitation results in an application-level denial-of-service, crashing the Substance 3D Designer application. There is no impact on confidentiality or data integrity — the CVSS metrics confirm availability impact only (A:H, C:N, I:N). The scope is unchanged, meaning the vulnerability is contained to the affected application and does not enable lateral movement or privilege escalation (GitHub Advisory).

There is no evidence of active in-the-wild exploitation or a publicly available proof-of-concept for CVE-2026-103827. The NVD SSVC assessment classifies exploitation as "none" and the vulnerability as not automatable, reflecting the requirement for user interaction. The EPSS score is approximately 0.152% (4th percentile), indicating a low probability of exploitation in the near term. The vulnerability is not listed in the CISA Known Exploited Vulnerabilities (KEV) catalog (GitHub Advisory, Adobe Advisory).

Adobe has released Substance 3D Designer version 16.0.7 to address this vulnerability; users running version 16.0.4 or earlier should update immediately. As a general precaution, users should avoid opening Substance 3D Designer files received from untrusted or unknown sources. Restricting user permissions and providing end-user awareness training on malicious file handling can further reduce the attack surface (Adobe Advisory, GitHub Advisory).