Quick answers
- Is CVE-2026-21306 exploited in the wild?
- No. Junglewise Threat Intelligence has no report of CVE-2026-21306 being exploited in the wild.
- How severe is CVE-2026-21306?
- High severity, with a CVSS score of 7.8, published 13 January 2026.
- Which products and versions are affected?
- Adobe Substance3D Sampler 5.1.0 and earlier.
- Is there a fix for CVE-2026-21306?
- 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-2026-21306 attacked?
- It is attacked with local access.
- Am I affected by CVE-2026-21306?
- Check whether you run Adobe Substance 3D Sampler or Adobe Substance3D Sampler 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 condition in Substance3D Sampler versions 5.1.0 and earlier, likely in the file parsing or deserialization routines. The flaw allows an attacker to write data beyond allocated memory boundaries, which can overwrite critical runtime structures and achieve arbitrary code execution. Exploitation requires user interaction—a victim must explicitly open a malicious file. The attack is triggered client-side with no authentication required. Upon successful exploitation, the attacker gains code execution with the privileges of the current user.
Affected products
- Adobe Substance3D Sampler 5.1.0 and earlier
Timeline
- 2026-01-13: disclosed