CVE-2026-16233 Overview
CVE-2026-16233 is a memory corruption vulnerability in NI LabVIEW that can lead to information disclosure or arbitrary code execution. The flaw affects NI LabVIEW 2026 Q3 (26.3.0) and prior versions. Exploitation requires an attacker to convince a user to open a specially crafted Virtual Instrument (.vi) file. The vulnerability is classified as an out-of-bounds write [CWE-787], a memory safety weakness that allows attackers to overwrite adjacent memory regions.
Critical Impact
Successful exploitation allows arbitrary code execution in the context of the user running LabVIEW, potentially leading to full compromise of the engineering workstation.
Affected Products
- NI LabVIEW 2026 Q3 (26.3.0)
- All NI LabVIEW versions prior to 2026 Q3
- Engineering workstations processing untrusted .vi files
Discovery Timeline
- 2026-08-25 - CVE-2026-16233 published to NVD
- 2026-08-26 - Last updated in NVD database
Technical Details for CVE-2026-16233
Vulnerability Analysis
The vulnerability is a memory corruption issue triggered when LabVIEW parses a malicious Virtual Instrument file. LabVIEW .vi files contain complex binary structures describing block diagrams, front panels, and embedded data. Improper validation of size or offset fields during parsing allows an attacker-controlled write beyond the bounds of an allocated buffer. This corruption can overwrite function pointers, return addresses, or heap metadata. An attacker can chain the corruption into arbitrary code execution or leak memory contents to disclose sensitive information from the LabVIEW process.
Root Cause
The root cause is an out-of-bounds write [CWE-787] in the .vi file parsing logic. LabVIEW trusts length or index values from the file without adequate bounds checking. When the parser writes attacker-supplied data into a fixed-size buffer using these unvalidated values, it corrupts adjacent memory. Because LabVIEW frequently runs with the privileges of an engineer or automation account, the impact extends to development environments and connected instrumentation.
Attack Vector
Exploitation requires local user interaction. An attacker delivers a crafted .vi file through email, shared network drives, project repositories, or supply-chain channels. When the target opens the file in LabVIEW, the malformed structures trigger the memory corruption. No network access to the target is required, and no authentication is needed on the LabVIEW instance itself. The attack aligns with common social engineering patterns targeting engineers and OT/ICS staff.
No public proof-of-concept exploit is available for CVE-2026-16233 at this time. See the NI Security Advisory for LabVIEW for authoritative technical details.
Detection Methods for CVE-2026-16233
Indicators of Compromise
- Unexpected .vi files arriving via email attachments, chat platforms, or removable media targeting engineering users
- LabVIEW process (LabVIEW.exe) spawning child processes such as cmd.exe, powershell.exe, or rundll32.exe
- Crashes or abnormal termination of LabVIEW.exe in Windows Event Log shortly after opening a .vi file
- Outbound network connections from LabVIEW.exe to unrecognized external hosts
Detection Strategies
- Monitor process creation events where LabVIEW is the parent, flagging any scripting or living-off-the-land binaries as children
- Alert on file writes to persistence locations (Run keys, Startup folders, scheduled tasks) initiated by LabVIEW
- Inspect .vi files received from external sources using file integrity and reputation checks before opening
- Correlate LabVIEW crash telemetry with subsequent suspicious behavior on the same host
Monitoring Recommendations
- Enable command-line and process ancestry logging on all engineering workstations running LabVIEW
- Ingest endpoint telemetry into a centralized data lake to hunt for anomalous LabVIEW behavior across the fleet
- Track LabVIEW version inventory to identify hosts still running 26.3.0 or earlier
How to Mitigate CVE-2026-16233
Immediate Actions Required
- Apply the vendor-supplied LabVIEW security update as published in the NI Security Advisory for LabVIEW
- Instruct users to only open .vi files from trusted, verified sources
- Restrict execution of LabVIEW to accounts without local administrator privileges where possible
- Inventory all LabVIEW installations and prioritize patching hosts exposed to external .vi files
Patch Information
NI has published a security advisory covering memory corruption vulnerabilities in LabVIEW, including CVE-2026-16233. Consult the NI Security Advisory for LabVIEW for fixed versions and download links. All LabVIEW installations at version 26.3.0 or earlier require the update.
Workarounds
- Block inbound .vi file attachments at the email gateway pending patch deployment
- Isolate LabVIEW workstations on segmented networks to limit lateral movement following exploitation
- Disable automatic file association handlers for .vi files on hosts that do not require LabVIEW
- Require code signing or checksum validation for .vi files sourced from shared project repositories
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
