CVE-2026-1283: SOLIDWORKS eDrawings Buffer Overflow Flaw

CVE-2026-1283 Overview

A Heap-based Buffer Overflow vulnerability has been identified in the EPRT file reading procedure within SOLIDWORKS eDrawings. This memory corruption vulnerability affects Release SOLIDWORKS 2025 through Release SOLIDWORKS 2026 and could allow an attacker to execute arbitrary code when a user opens a specially crafted EPRT file.

Critical Impact

Successful exploitation of this vulnerability could allow attackers to execute arbitrary code with the privileges of the user running SOLIDWORKS eDrawings, potentially leading to complete system compromise.

Affected Products

• SOLIDWORKS eDrawings Release 2025
• SOLIDWORKS eDrawings Release 2026
• Systems where users open untrusted EPRT files

Discovery Timeline

• January 26, 2026 - CVE-2026-1283 published to NVD
• January 26, 2026 - Last updated in NVD database

Technical Details for CVE-2026-1283

Vulnerability Analysis

This vulnerability is classified as CWE-122 (Heap-based Buffer Overflow), a memory corruption condition that occurs when data is written beyond the boundaries of allocated heap memory. In the context of SOLIDWORKS eDrawings, the flaw exists specifically within the EPRT file parsing functionality.

The vulnerability requires local access and user interaction to exploit, as an attacker must convince a victim to open a maliciously crafted EPRT file. However, once triggered, the heap overflow can corrupt adjacent memory structures, potentially allowing an attacker to overwrite critical data structures, function pointers, or metadata used by the heap allocator.

Successful exploitation results in arbitrary code execution with the same privilege level as the user running the affected application, enabling attackers to achieve full confidentiality, integrity, and availability impacts on the target system.

Root Cause

The root cause of this vulnerability lies in improper bounds checking during the EPRT file parsing process. When SOLIDWORKS eDrawings processes an EPRT file, it allocates heap memory to store file data structures. The parsing routine fails to properly validate the size or structure of certain elements within the EPRT file format before copying data into the allocated buffer.

An attacker can craft an EPRT file with oversized or malformed data fields that exceed the allocated buffer size, causing a heap-based buffer overflow condition. This memory corruption can be leveraged to gain control of program execution flow.

Attack Vector

The attack vector for CVE-2026-1283 requires local access and user interaction. The exploitation scenario typically involves:

1. An attacker crafts a malicious EPRT file containing specially structured data designed to trigger the heap overflow
2. The malicious file is delivered to the victim through social engineering methods such as email attachments, shared drives, or download links
3. The victim opens the EPRT file using a vulnerable version of SOLIDWORKS eDrawings
4. During file parsing, the heap overflow occurs, corrupting memory
5. The attacker's code executes with the victim's privileges

The vulnerability is particularly concerning in engineering and manufacturing environments where EPRT files are commonly exchanged between organizations and vendors. For detailed technical information, refer to the 3DS Security Advisory for CVE-2026-1283.

Detection Methods for CVE-2026-1283

Indicators of Compromise

• Unexpected crashes or abnormal termination of SOLIDWORKS eDrawings when opening EPRT files
• Suspicious EPRT files with unusual file sizes or structures received from untrusted sources
• Evidence of post-exploitation activity following the opening of EPRT files (new processes, network connections, file modifications)
• Memory access violations or heap corruption errors logged in Windows Event Viewer

Detection Strategies

• Deploy endpoint detection solutions capable of monitoring for heap spray techniques and memory corruption exploitation patterns
• Implement file type filtering on email gateways and web proxies to scan or block EPRT files from untrusted sources
• Use application whitelisting to prevent unauthorized code execution following potential exploitation
• Enable Windows Exploit Protection features such as heap integrity validation and address space layout randomization (ASLR)

Monitoring Recommendations

• Monitor for unusual child processes spawned by SOLIDWORKS eDrawings application processes
• Track file access events for EPRT files, particularly those originating from external sources or temporary directories
• Enable enhanced logging for application crashes and memory exceptions
• Review endpoint telemetry for behavioral anomalies following EPRT file access events

How to Mitigate CVE-2026-1283

Immediate Actions Required

• Update SOLIDWORKS eDrawings to the latest patched version as recommended by Dassault Systèmes
• Restrict opening of EPRT files from untrusted or unknown sources until patches are applied
• Educate users about the risks of opening unsolicited EPRT files received via email or file sharing platforms
• Implement network segmentation to limit the blast radius of potential compromises

Patch Information

Dassault Systèmes has published a security advisory addressing this vulnerability. Organizations running SOLIDWORKS eDrawings Release 2025 through Release 2026 should consult the official 3DS Security Advisory for CVE-2026-1283 for specific patch information and remediation guidance.

Apply vendor-provided security updates as soon as they become available through your standard patch management process.

Workarounds

• Quarantine or block EPRT files at the network perimeter until patches can be applied
• Use an isolated virtual machine environment when opening EPRT files from untrusted sources
• Temporarily disable or restrict access to SOLIDWORKS eDrawings for non-essential users
• Implement strict least-privilege policies to minimize the impact of potential exploitation

# Windows: Block EPRT file execution via Software Restriction Policy (temporary mitigation)
# Run in elevated PowerShell

# Create file association warning for .eprt files
reg add "HKEY_CLASSES_ROOT\.eprt\shell\open\command" /ve /d "cmd /c echo Warning: EPRT files temporarily blocked for security. Contact IT for assistance. && pause" /f

# Note: This is a temporary workaround. Apply vendor patches as the primary remediation.
# To restore: Remove the registry modification and reinstall SOLIDWORKS eDrawings