CVE-2026-21348: Adobe Substance 3D Modeler Info Disclosure

CVE-2026-21348 Overview

CVE-2026-21348 is an out-of-bounds read vulnerability affecting Adobe Substance 3D Modeler versions 1.22.5 and earlier. This memory safety issue could allow an attacker to disclose sensitive information stored in memory by leveraging improper boundary checks during file processing operations. Exploitation requires user interaction, specifically that a victim must open a malicious file crafted to trigger the out-of-bounds read condition.

Critical Impact

Successful exploitation could lead to the disclosure of sensitive memory contents, potentially exposing confidential data, cryptographic keys, or other information that could facilitate further attacks.

Affected Products

• Adobe Substance 3D Modeler versions 1.22.5 and earlier
• All platforms running vulnerable Substance 3D Modeler versions

Discovery Timeline

• 2026-02-10 - CVE-2026-21348 published to NVD
• 2026-02-12 - Last updated in NVD database

Technical Details for CVE-2026-21348

Vulnerability Analysis

This vulnerability is classified as CWE-125 (Out-of-Bounds Read), a memory corruption flaw that occurs when software reads data past the boundary of an allocated memory buffer. In the context of Adobe Substance 3D Modeler, this flaw manifests when the application processes specially crafted files that cause the software to read beyond the intended memory boundaries.

The local attack vector means an attacker must either have local access to the system or must convince a user to open a malicious file. The vulnerability requires no special privileges but does require user interaction, meaning social engineering tactics such as phishing may be employed to deliver malicious files to potential victims.

Root Cause

The root cause of this vulnerability lies in insufficient bounds checking during file parsing operations within Adobe Substance 3D Modeler. When processing certain file structures, the application fails to properly validate the size or offset of data being read, allowing memory contents beyond the allocated buffer to be accessed and potentially exfiltrated.

Attack Vector

The attack scenario involves an adversary crafting a malicious file that, when opened in Adobe Substance 3D Modeler, triggers the out-of-bounds read condition. The attacker would need to deliver this file to the victim through methods such as:

• Email attachments disguised as legitimate 3D model files
• Compromised file-sharing platforms or repositories
• Malicious websites offering "free" 3D assets
• Supply chain attacks targeting design workflows

When the victim opens the malicious file, the application processes the crafted data and reads beyond the allocated buffer, potentially exposing sensitive memory contents that could be captured by the attacker if combined with additional exploitation techniques.

Detection Methods for CVE-2026-21348

Indicators of Compromise

• Unexpected crashes or abnormal behavior when opening 3D model files in Substance 3D Modeler
• Unusual memory access patterns or error logs indicating out-of-bounds operations
• Presence of suspicious or unexpected file types in project directories

Detection Strategies

• Monitor for anomalous file access patterns involving Adobe Substance 3D Modeler
• Implement endpoint detection rules to identify suspicious file interactions with 3D modeling applications
• Enable application crash reporting to capture potential exploitation attempts
• Deploy file integrity monitoring on directories containing 3D assets

Monitoring Recommendations

• Enable verbose logging for Adobe Substance 3D Modeler to capture file processing events
• Implement network monitoring to detect potential data exfiltration following file opening
• Configure SIEM rules to correlate Substance 3D Modeler activity with suspicious file sources

How to Mitigate CVE-2026-21348

Immediate Actions Required

• Update Adobe Substance 3D Modeler to the latest patched version as soon as available
• Avoid opening untrusted or unsolicited 3D model files until the patch is applied
• Implement application whitelisting to restrict file types processed by Substance 3D Modeler
• Educate users about the risks of opening files from unknown or untrusted sources

Patch Information

Adobe has released security updates to address this vulnerability. Refer to the Adobe Security Advisory APSB26-22 for detailed patch information and download links. Organizations should prioritize applying this update to all systems running Adobe Substance 3D Modeler versions 1.22.5 and earlier.

Workarounds

• Restrict access to Adobe Substance 3D Modeler to only authorized users who require it for their work
• Implement network segmentation to isolate workstations running 3D modeling software
• Use sandboxing solutions to open untrusted files in an isolated environment
• Temporarily disable the application if not critical to operations until the patch can be applied