CVE-2026-5495: Labcenter Proteus PDSPRJ RCE Vulnerability

CVE-2026-5495 Overview

CVE-2026-5495 is a high-severity out-of-bounds write vulnerability affecting Labcenter Electronics Proteus. This vulnerability allows remote attackers to execute arbitrary code on affected installations through maliciously crafted PDSPRJ files. User interaction is required to exploit this vulnerability, as the target must visit a malicious page or open a malicious file.

The specific flaw exists within the processing of PDSPRJ files. The issue results from the lack of proper validation of user-supplied data, which can result in a write past the end of an allocated buffer. An attacker can leverage this vulnerability to execute code in the context of the current process.

Critical Impact

Successful exploitation enables remote code execution in the context of the current process, potentially leading to complete system compromise when a user opens a malicious PDSPRJ file.

Affected Products

• Labcenter Electronics Proteus (specific versions not disclosed)

Discovery Timeline

• 2026-04-11 - CVE-2026-5495 published to NVD
• 2026-04-13 - Last updated in NVD database

Technical Details for CVE-2026-5495

Vulnerability Analysis

This vulnerability (tracked as ZDI-CAN-25720) is classified as CWE-787: Out-of-bounds Write. The flaw resides in the PDSPRJ file parsing functionality within Labcenter Electronics Proteus, a popular electronic design automation (EDA) software used for circuit simulation and PCB design.

When Proteus processes a specially crafted PDSPRJ project file, the application fails to properly validate user-supplied data boundaries. This insufficient validation allows an attacker to write data beyond the allocated memory buffer, corrupting adjacent memory regions and potentially overwriting critical program data or control structures.

Root Cause

The root cause of CVE-2026-5495 lies in the improper validation of user-supplied data during PDSPRJ file parsing. The parsing routine does not adequately verify the size and boundaries of data elements within the project file before writing them to memory buffers. This lack of bounds checking allows specially crafted input to trigger writes past the end of allocated memory regions.

Attack Vector

The attack vector for this vulnerability is local, requiring user interaction. An attacker must craft a malicious PDSPRJ file and convince a target user to open it. This can be accomplished through various social engineering techniques:

The malicious file could be delivered via email attachment, hosted on a compromised or attacker-controlled website, or distributed through file-sharing platforms. When a user opens the crafted PDSPRJ file with a vulnerable version of Proteus, the out-of-bounds write occurs during file parsing, enabling arbitrary code execution in the context of the current process.

For detailed technical information, refer to the Zero Day Initiative Advisory ZDI-26-257.

Detection Methods for CVE-2026-5495

Indicators of Compromise

• Unexpected PDSPRJ files received from unknown or suspicious sources
• Proteus application crashes or abnormal behavior when opening project files
• Unusual process spawning or network connections originating from the Proteus process
• Memory corruption artifacts or debug logs indicating buffer overflows

Detection Strategies

• Monitor file system activity for PDSPRJ files from untrusted sources or unusual locations
• Implement endpoint detection rules to identify abnormal Proteus process behavior
• Deploy application whitelisting to prevent unauthorized code execution from the Proteus context
• Enable enhanced logging for application crashes and memory access violations

Monitoring Recommendations

• Configure SentinelOne agents to monitor for memory corruption indicators in Proteus processes
• Establish baseline behavior for Proteus application and alert on deviations
• Monitor email gateways for suspicious PDSPRJ file attachments
• Track and investigate any instances of Proteus spawning unexpected child processes

How to Mitigate CVE-2026-5495

Immediate Actions Required

• Do not open PDSPRJ files from untrusted or unknown sources
• Implement strict email filtering to block or quarantine PDSPRJ attachments from external senders
• Educate users about the risks of opening unsolicited project files
• Consider restricting Proteus usage to isolated environments until a patch is available

Patch Information

At the time of publication, patch information from Labcenter Electronics is not available in the CVE data. Organizations should monitor the Zero Day Initiative Advisory ZDI-26-257 and Labcenter Electronics official channels for updates on available security patches.

Workarounds

• Implement application sandboxing to limit the impact of potential exploitation
• Use virtual machines or isolated environments when working with PDSPRJ files from external sources
• Configure endpoint protection solutions to monitor and restrict Proteus process behavior
• Temporarily disable automatic file associations for PDSPRJ files to prevent accidental opening