CVE-2026-103830 Overview
CVE-2026-103830 is a stack-based buffer overflow vulnerability in Adobe Substance3D Stager. The flaw allows arbitrary code execution in the context of the current user when a victim opens a malicious file. The issue is tracked under Common Weakness Enumeration [CWE-121] and carries a CVSS 3.1 base score of 7.8.
Adobe disclosed the issue in security bulletin APSB26-170. Exploitation requires local access and user interaction, which lowers remote exposure but keeps the risk relevant for workstations that process untrusted 3D asset files.
Critical Impact
Successful exploitation grants arbitrary code execution under the current user account, enabling data theft, lateral movement, or persistence on the host.
Affected Products
- Adobe Substance3D Stager (see Adobe advisory APSB26-170 for affected versions)
- Workstations used by 3D artists, designers, and media production teams
- Any system where users open Substance3D Stager project or asset files from untrusted sources
Discovery Timeline
- 2026-10-13 - CVE-2026-103830 published to the National Vulnerability Database
- 2026-10-14 - Last updated in NVD database
Technical Details for CVE-2026-103830
Vulnerability Analysis
The vulnerability is a stack-based buffer overflow [CWE-121] in Adobe Substance3D Stager. Stager writes attacker-controlled data past the bounds of a fixed-size stack buffer during file parsing. The overflow corrupts adjacent stack memory, including saved return addresses and local variables.
An attacker who controls the overflowing data can redirect execution flow. The result is arbitrary code execution inside the Stager process, running with the privileges of the logged-in user. No elevation of privilege is required beyond that user context.
Exploitation is file-based and requires user interaction. A victim must open a crafted Stager project, scene, or asset file delivered through email, chat, a shared drive, or a compromised website.
Root Cause
The root cause is missing or incorrect bounds checking in a file-parsing routine. Stager copies untrusted data from a malicious input file into a stack-allocated buffer without validating the length against the destination size. When the input exceeds the buffer, adjacent stack frames are overwritten.
Attack Vector
The attack vector is local and requires user interaction, as reflected in the CVSS vector. An attacker crafts a malicious Substance3D Stager file and delivers it through social engineering. When the victim opens the file in a vulnerable version of Stager, the parser triggers the overflow and the attacker's payload executes.
No authentication is required against the target system. No public proof-of-concept exploit is listed in the available CVE references, and the issue is not present in the CISA Known Exploited Vulnerabilities catalog at the time of publication.
Technical specifics of the vulnerable parsing routine are not published. See the Adobe Security Update APSB26-170 for vendor details and fixed versions.
Stop Remote Code Execution Before It Runs
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Stop Exploit AttemptsDetection Methods for CVE-2026-103830
Indicators of Compromise
- Unexpected child processes spawned by the Substance3D Stager executable, such as cmd.exe, powershell.exe, or /bin/sh.
- Substance3D Stager crashes or access violation events immediately after opening a project or asset file from an untrusted source.
- Outbound network connections initiated from the Stager process to unfamiliar domains or IP addresses.
- New files written to user-writable persistence locations shortly after Stager opens an incoming file.
Detection Strategies
- Monitor process creation events where the parent is Substance3D Stager and the child is a shell, scripting host, or living-off-the-land binary.
- Alert on Stager process crashes correlated with the opening of files received from external sources.
- Hunt for Stager processes performing non-standard activity such as credential access, registry modification, or scheduled task creation.
Monitoring Recommendations
- Collect endpoint process, file, and network telemetry from workstations running Substance3D Stager and forward it to a central SIEM or data lake.
- Baseline normal Stager behavior for creative teams so anomalous child processes and outbound connections stand out.
- Track inventory of Substance3D Stager versions across the fleet and flag hosts that remain below the patched build in APSB26-170.
How to Mitigate CVE-2026-103830
Immediate Actions Required
- Apply the Adobe update referenced in APSB26-170 to all workstations running Substance3D Stager.
- Instruct users to avoid opening Substance3D project or asset files from untrusted email, chat, or web sources until patched.
- Prioritize patching on hosts used by users with elevated privileges or access to sensitive repositories.
- Validate that endpoint protection and logging are active on all creative workstations.
Patch Information
Adobe published the fix in security bulletin Adobe Security Update APSB26-170. Review the bulletin for the exact fixed versions and apply the update through the Adobe Creative Cloud desktop application or enterprise deployment tooling.
Workarounds
- Restrict opening of Substance3D Stager files to those sourced from internal, trusted repositories only.
- Run Substance3D Stager under a standard user account rather than an administrator to limit post-exploitation impact.
- Use application control or allowlisting to block Stager from launching scripting hosts and shells.
- Isolate creative workstations on a segmented network to limit lateral movement following a successful compromise.
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
