What is CVE-2026-21307?

CVE-2026-21307 is a high-severity vulnerability in Adobe Substance3d - Designer, classified under Out-of-bounds Write. CVSS score: 7.8/10. Published 2026-01-13.

How severe is CVE-2026-21307?

High severity. CVSS v3 base score is 7.8 out of 10.

Buffer overflow in Adobe Substance3d - Designer

CVE-2026-21307

Substance3D - Designer versions 15.0.3 and earlier are affected by an out-of-bounds write vulnerability that could result in arbitrary code execution in the context of the current user. Exploitation of this issue requires user interaction…

Vulnerability class: Buffer Overflow

EPSS: 0.000 (15.2th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 7.8 (High). Vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H.

Affected products

Adobe Substance3d - Designer — versions 0

Weakness classification (CWE)

CWE-787 — Out-of-bounds Write

References

helpx.adobe.com/security/products/substance3d_designer/apsb26-13.html (vendor-advisory)

Frequently asked questions

What is CVE-2026-21307?: CVE-2026-21307 is a high-severity vulnerability in Adobe Substance3d - Designer, classified under Out-of-bounds Write. CVSS score: 7.8/10. Published 2026-01-13.
How severe is CVE-2026-21307?: High severity. CVSS v3 base score is 7.8 out of 10.