Quick answers
- Is CVE-2026-21307 exploited in the wild?
- No. Junglewise Threat Intelligence has no report of CVE-2026-21307 being exploited in the wild.
- How severe is CVE-2026-21307?
- High severity, with a CVSS score of 7.8, published 13 January 2026.
- Which products and versions are affected?
- Adobe Substance3D Designer 15.0.3 and earlier.
- Is there a fix for CVE-2026-21307?
- No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.
- How is CVE-2026-21307 attacked?
- It is attacked with local access.
- Am I affected by CVE-2026-21307?
- Check whether you run Adobe Substance 3d Designer or Adobe Substance3D Designer at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.
Technical details
The vulnerability is an out-of-bounds write flaw in Substance3D Designer versions 15.0.3 and earlier. The root cause appears to be improper bounds checking during file parsing or processing. Attack vector is local and requires user interaction: a victim must explicitly open a specially crafted malicious file. Successful exploitation allows arbitrary code execution in the context of the current user. The flaw affects versions up to and including 15.0.3; patch status for newer versions is implied but details are not available in the advisory.
Affected products
- Adobe Substance3D Designer 15.0.3 and earlier
Timeline
- 2026-01-13: disclosed