CVE-2026-44412: Solid Edge Buffer Overflow Vulnerability

CVE-2026-44412 Overview

CVE-2026-44412 is a stack-based buffer overflow vulnerability in Siemens Solid Edge SE2026, affecting all versions prior to V226.0 Update 5. The flaw resides in the application's parser for PAR files, Solid Edge's native part file format. An attacker can craft a malicious PAR file that overflows a stack buffer during parsing, leading to arbitrary code execution in the context of the current user process. Exploitation requires user interaction, typically by convincing a victim to open a crafted file.

Critical Impact

Successful exploitation allows attackers to execute arbitrary code within the Solid Edge process, compromising confidentiality, integrity, and availability of the affected workstation [CWE-121].

Affected Products

• Siemens Solid Edge SE2026, all versions before V226.0 Update 5
• Engineering workstations running vulnerable Solid Edge installations
• CAD pipelines that automatically open or preview PAR files

Discovery Timeline

• 2026-05-12 - CVE CVE-2026-44412 published to NVD
• 2026-05-12 - Last updated in NVD database

Technical Details for CVE-2026-44412

Vulnerability Analysis

The vulnerability is a stack-based buffer overflow [CWE-121] triggered during the parsing of specially crafted PAR files in Solid Edge SE2026. When the application processes attacker-controlled fields within the PAR file structure, it writes data past the bounds of a fixed-size stack buffer. This overwrite can corrupt local variables, saved frame pointers, and the return address on the stack.

By controlling the overflow payload, an attacker can redirect execution flow and run arbitrary code in the context of the current process. Because the issue manifests during normal file parsing, no privilege escalation or network position is required. The attack vector is local and depends on a user opening the malicious file.

Root Cause

The root cause is missing or insufficient bounds validation in the PAR file parsing routines. Length fields or record sizes supplied by the file are trusted and used to copy data into a fixed stack buffer without verifying that the source data fits the destination. This pattern is the canonical condition described by CWE-121: Stack-based Buffer Overflow.

Attack Vector

The attack requires local access combined with user interaction. An attacker delivers a weaponized PAR file through email, shared engineering repositories, cloud storage, or supply chain channels. When the victim opens the file in Solid Edge, the parser triggers the overflow and executes the embedded payload at the privilege level of the user. The vulnerability does not require authentication on the target system beyond the user's own session.

No verified public proof-of-concept code is available. Refer to the Siemens Security Advisory SSA-921111 for vendor technical details.

Detection Methods for CVE-2026-44412

Indicators of Compromise

• Unexpected child processes spawned by Edge.exe or other Solid Edge executables, such as cmd.exe, powershell.exe, or rundll32.exe
• PAR files received from untrusted sources, especially those staged in user download folders or email attachments
• Solid Edge process crashes with access violations referencing stack memory addresses
• Outbound network connections initiated by Solid Edge processes immediately after opening a file

Detection Strategies

• Monitor process lineage where Solid Edge applications act as parents to interpreters, scripting hosts, or living-off-the-land binaries
• Inspect Windows Error Reporting and crash dumps for repeated Edge.exe faults with stack corruption signatures
• Apply YARA or content inspection rules at email and file-sharing gateways to flag malformed PAR file structures

Monitoring Recommendations

• Audit endpoints running Solid Edge SE2026 and inventory versions to identify systems below V226.0 Update 5
• Log file open events and command-line activity on CAD workstations and forward to a central SIEM
• Alert on Solid Edge processes loading unsigned modules or performing memory regions transitions to executable

How to Mitigate CVE-2026-44412

Immediate Actions Required

• Update all Solid Edge SE2026 installations to V226.0 Update 5 or later
• Restrict the opening of PAR files originating from untrusted or external sources
• Apply application allowlisting to block execution of unsigned child processes spawned by Solid Edge
• Communicate to engineering teams the risk of opening PAR files received via email or unmanaged file shares

Patch Information

Siemens has released V226.0 Update 5 to address this vulnerability. Refer to the Siemens Security Advisory SSA-921111 for full patch details, fixed version downloads, and additional vendor guidance.

Workarounds

• Only open PAR files received from trusted, verified sources
• Isolate CAD workstations on segmented networks with limited internet exposure
• Enable operating system exploit mitigations such as DEP, ASLR, and Control Flow Guard on workstations running Solid Edge
• Use email gateways and endpoint controls to quarantine PAR file attachments pending review

# Example: locate Solid Edge installations and check version on Windows endpoints
Get-WmiObject -Class Win32_Product | Where-Object { $_.Name -like "*Solid Edge*" } | Select-Object Name, Version, InstallDate