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Out-of-bounds write leading to code execution in Adobe Substance 3D Stager
CVE-2026-103838 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 context of the current user. The specific vulnerable function and file format have not been identified. The vulnerability is rated High with a CVSS v3.1 base score of 7.8.
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 confidentiality, integrity, and availability by executing attacker-controlled code with the victim user's privileges. The vulnerability does not inherently grant privileges beyond those of the current user.
If you can’t patch tonight, do this now.
Until the update is installed, avoid opening untrusted or suspicious files in Adobe Substance 3D Stager. No vendor-provided workaround has been identified.
Patch, then assume compromise.
Upgrade Adobe Substance 3D Stager to version 3.1.9 or later, which addresses the vulnerability. Install the update through the Creative Cloud desktop app, or deploy the updated application through Adobe Admin Console in managed environments.
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.