# CVE-2026-48421: Adobe Substance3D Sampler out-of-bounds write

Source: https://junglewise.ai/threats/cve-2026-48421-adobe-substance3d-sampler-out-of-bounds-write  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-08-25. Updated: 2026-09-25  
License: CC BY 4.0 with a link back

CVE-2026-48421 · Severity: high · CVSS 7.8 · Published 2026-08-25

Adobe Substance3D Sampler is a 3D design and texture creation tool used by digital artists and designers. The application is affected by an out-of-bounds write vulnerability that could allow an attacker to execute arbitrary code with the privileges of the user running the application. Exploitation requires a victim to open a specially crafted malicious file, making this a practical risk in design workflows where files are frequently shared and opened.

Technologies: [Adobe Substance 3D Sampler](https://junglewise.ai/threats/technologies/substance-3d-sampler), [Adobe Substance3D Sampler](https://junglewise.ai/threats/technologies/substance3d-sampler). Vendors: [Adobe](https://junglewise.ai/threats/vendors/adobe).

## Quick answers

**Is CVE-2026-48421 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-48421 being exploited in the wild.

**How severe is CVE-2026-48421?** High severity, with a CVSS score of 7.8, published 25 August 2026.

**Which products and versions are affected?** Adobe Substance3D Sampler.

**Is there a fix for CVE-2026-48421?** 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-2026-48421 attacked?** It is attacked with local access, in a software library.

**Am I affected by CVE-2026-48421?** Check whether you run Adobe Substance 3D Sampler or Adobe Substance3D Sampler. 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 a classic out-of-bounds write flaw in memory management, occurring when the application writes data beyond the allocated bounds of a buffer. This allows an attacker to overwrite adjacent memory regions, potentially corrupting heap metadata or overwriting function pointers to achieve arbitrary code execution. The attack vector is local and user-initiated: a victim must open a malicious file in Substance3D Sampler for the vulnerability to trigger. No authentication or elevated privileges are required for exploitation beyond the user interaction of opening the file. The specific affected versions and patch availability details are not currently accessible, but Adobe has issued advisory APSB26-121.

## Affected products

- Adobe Substance3D Sampler

## Timeline

- 2026-08-25: disclosed: Publicly disclosed via NVD and Adobe advisory APSB26-121

## References

- [https://helpx.adobe.com/security/products/substance3d-sampler/apsb26-121.html](https://helpx.adobe.com/security/products/substance3d-sampler/apsb26-121.html)

## Related threats

- [Adobe Substance 3D Sampler out-of-bounds write in file parsing](https://junglewise.ai/threats/cve-2026-83966-substance3d-sampler-is-affected-by-an-out-of-bounds-write)
- [Adobe Substance 3D Sampler stack-based buffer overflow](https://junglewise.ai/threats/cve-2026-83965-substance3d-sampler-is-affected-by-a-stack-based-buffer-overflow)
- [Adobe Substance 3D Sampler out-of-bounds read](https://junglewise.ai/threats/cve-2026-100131-substance3d-sampler-is-affected-by-an-out-of-bounds-read)
- [Adobe Substance 3D Sampler out-of-bounds read in memory](https://junglewise.ai/threats/cve-2026-100130-substance3d-sampler-is-affected-by-an-out-of-bounds-read)
- [Adobe Substance3D Sampler heap buffer overflow](https://junglewise.ai/threats/cve-2026-83959-adobe-substance3d-sampler-heap-buffer-overflow)