CVE-2026-21342
HIGHCVSS Vector
CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
Lifecycle Timeline
2Description
Substance3D - Stager versions 3.1.6 and earlier are affected by an out-of-bounds write vulnerability that could result in arbitrary code execution in the context of the current user. Exploitation of this issue requires user interaction in that a victim must open a malicious file.
Analysis
Arbitrary code execution in Substance 3D Stager 3.1.6 and earlier results from an out-of-bounds write vulnerability that executes with user privileges. An attacker can exploit this by crafting a malicious file that, when opened by a victim, triggers the memory corruption and executes arbitrary code. …
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Remediation
Within 24 hours: Identify all Substance3D Stager installations and document current versions in use. Within 7 days: Disable Substance3D Stager if not business-critical, restrict file access to trusted sources only, and implement user awareness training on file opening risks. …
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External POC / Exploit Code
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