CVE-2026-21339 Substance3D - Designer | Out-of-bounds Read (CWE-125)
An out-of-bounds read in Adobe Substance 3D Designer allows attackers to disclose sensitive memory information by tricking users into opening malicious files.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Local or same network only
- Victim action needed
- A user has to click or open something
- Fix
- None listed
What is CVE-2026-21339?
CVE-2026-21339 is a medium-severity vulnerability in Adobe Substance 3d Designer, published on 10 Feb 2026. It can only be exploited from the same machine or local network, and only if a user opens a file or follows a link.
Official description
Substance3D - Designer versions 15.1.0 and earlier are affected by an out-of-bounds read vulnerability that could lead to memory exposure. An attacker could leverage this vulnerability to disclose sensitive information stored in memory. Exploitation of this issue requires user interaction in that a victim must open a malicious file.
Weakness: CWE-125
Which versions are affected by CVE-2026-21339?
It affects 1 product.
Products include Adobe Substance 3d Designer.
How do I fix CVE-2026-21339?
No fix has been published for CVE-2026-21339 yet. Limit exposure of the affected software until one is available.
Is CVE-2026-21339 being exploited?
There is no known exploitation of CVE-2026-21339 in the wild and no public exploit code.
Other vulnerabilities in Adobe Substance 3d Designer
- CVE-2026-103821 Substance3D - Designer | Out-of-bounds Write (CWE-787)
- CVE-2026-48426 Substance3D - Designer | Out-of-bounds Write (CWE-787)
- CVE-2026-48427 Substance3D - Designer | Out-of-bounds Write (CWE-787)
- CVE-2026-48428 Substance3D - Designer | Heap-based Buffer Overflow (CWE-122)
- CVE-2026-48430 Substance3D - Designer | Heap-based Buffer Overflow (CWE-122)
Sources
Also known as GHSA-5848-q9pf-4h9c.