What is the CVSS score of CVE-2026-21343?

CVE-2026-21343 has a CVSS 3.1 base score of 7.8 (High). CVSS vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H. EPSS exploitation probability: 0.0%.

Which versions of Substance 3d Stager are affected by CVE-2026-21343?

Substance3D Stager versions 3.1.6 and earlier contain a memory vulnerability that could allow attackers to crash the application or potentially execute code by uploading crafted files.

How to fix or mitigate CVE-2026-21343?

Within 24 hours: inventory all Substance3D Stager installations and versions in use; disable file upload functionality if possible or restrict to trusted users only. Within 7 days: implement network segmentation to isolate affected systems and disable external access to Stager instances. Within 30 days: monitor Adobe security advisories for patch availability and develop a deployment plan; consider upgrading to version 3.1.7 or later once released.

Substance 3d Stager CVE-2026-21343

HIGH

Out-of-bounds Read (CWE-125)

2026-02-10 psirt@adobe.com

Buffer Overflow Information Disclosure Substance 3d Stager

7.8

CVSS 3.1 · NVD

Severity by source

NVD PRIMARY

7.8 HIGH

AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

Primary rating from NVD · only source for this CVE.

CVSS VectorNVD

CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

Attack Vector

Local

Attack Complexity

Low

Privileges Required

None

User Interaction

Required

Scope

Unchanged

Confidentiality

High

Integrity

High

Availability

High

Lifecycle Timeline

Analysis Generated

Mar 12, 2026 - 22:02 vuln.today

CVE Published

Feb 10, 2026 - 19:15 nvd

HIGH 7.8

DescriptionCVE.org

Substance3D - Stager versions 3.1.6 and earlier are affected by an out-of-bounds read vulnerability when parsing a crafted file, which could result in a read past the end of an allocated memory structure. An attacker could leverage this vulnerability to execute code in the context of the current user. Exploitation of this issue requires user interaction in that a victim must open a malicious file.

AnalysisAI

Code execution in Substance 3D Stager 3.1.6 and earlier results from an out-of-bounds read vulnerability in malformed file parsing that allows attackers to corrupt memory and execute arbitrary code within the user's context. The vulnerability requires user interaction, as victims must open a specially crafted file to trigger exploitation. No patch is currently available for this high-severity flaw.

Technical ContextAI

Classified as CWE-125 (Out-of-bounds Read). Affects Substance 3D Stager. Substance3D - Stager versions 3.1.6 and earlier are affected by an out-of-bounds read vulnerability when parsing a crafted file, which could result in a read past the end of an allocated memory structure. An attacker could leverage this vulnerability to execute code in the context of the current user. Exploitation of this issue requires user interaction in that a victim must open a malicious file.