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Out-of-bounds Write in Adobe Substance 3D Stager
CVE-2026-103834 is an out-of-bounds write vulnerability in Adobe Substance 3D Stager 3.1.8 and earlier on Windows and macOS. Opening a malicious file can trigger memory corruption and allow arbitrary code execution in the current user's context. Exploitation requires user interaction. The vulnerability is rated high severity with a CVSS v3.1 base score of 7.8. The specific vulnerable function and affected file format have not been identified.
What it means and what to do now: patch path, interim mitigations, and the assume-compromise checklist.
What an attacker gets, and what they’ve been doing with it.
Successful exploitation can compromise the confidentiality, integrity, and availability of resources accessible to the current user through arbitrary code execution. The vulnerability does not inherently grant privileges beyond those of the user running the application.
If you can’t patch tonight, do this now.
Avoid opening untrusted or unexpected files in Adobe Substance 3D Stager until the application is updated. No vendor-provided workaround is identified.
Patch, then assume compromise.
Upgrade Adobe Substance 3D Stager to version 3.1.9 or later on Windows and macOS. Install the update through the Creative Cloud desktop app; administrators can deploy the updated application through Adobe Admin Console.
No public exploits tracked yet. Mallory keeps watching.
Products and vendors Mallory has correlated with this vulnerability. Open in Mallory to drill down to specific CPE configurations and version ranges.
4 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.