Quick answers
- Is CVE-2026-21308 exploited in the wild?
- No. Junglewise Threat Intelligence has no report of CVE-2026-21308 being exploited in the wild.
- How severe is CVE-2026-21308?
- Medium severity, with a CVSS score of 5.5, published 13 January 2026.
- Which products and versions are affected?
- Adobe Substance3D Designer 15.0.3 and earlier.
- Is there a fix for CVE-2026-21308?
- 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-2026-21308 attacked?
- It is attacked with local access.
- Am I affected by CVE-2026-21308?
- 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 read in Substance3D Designer's file parsing logic, affecting versions 15.0.3 and earlier. An attacker can craft a malicious design file that triggers the out-of-bounds read when opened by a victim, allowing memory disclosure. The attack requires user interaction (opening the malicious file) and local execution context; the vulnerability does not provide remote code execution or privilege escalation. Adobe has patched this issue in versions later than 15.0.3.
Affected products
- Adobe Substance3D Designer 15.0.3 and earlier
Timeline
- 2026-01-13: disclosed