CVE-2026-18444: NI LabVIEW RCE Vulnerability

CVE-2026-18444 is a remote code execution flaw in NI LabVIEW caused by an integer conversion error during image loading. Attackers can exploit this to disclose information or execute arbitrary code. This article covers technical details, affected versions, impact analysis, and mitigation strategies.

CVE-2026-18444 Overview

CVE-2026-18444 is an integer conversion vulnerability in NI LabVIEW that produces an out-of-bounds read when the application loads images. The flaw affects NI LabVIEW 2026 Q3 and prior versions. Successful exploitation requires an attacker to convince a user to open a specially crafted VI file. The condition can lead to information disclosure or arbitrary code execution within the context of the LabVIEW process. The weakness is classified under [CWE-195] (Signed to Unsigned Conversion Error).

Critical Impact
Opening a malicious VI file can trigger memory disclosure or code execution in the LabVIEW process, exposing engineering data and enabling attacker persistence on operator workstations.

Affected Products

NI LabVIEW 2026 Q3
NI LabVIEW versions prior to 2026 Q3
Systems processing untrusted VI files with vulnerable LabVIEW builds

Discovery Timeline

2026-08-25 - CVE-2026-18444 published to NVD
2026-08-26 - Last updated in NVD database

Technical Details for CVE-2026-18444

Vulnerability Analysis

The vulnerability resides in the LabVIEW image-loading routine. LabVIEW parses image data embedded in or referenced by a VI file when the file is opened. During parsing, a size or offset value undergoes an unsafe integer conversion. The converted value is then used to index or read image buffer memory.

Because the conversion produces a value outside the intended range, the parser reads past the allocated buffer. This out-of-bounds read can return adjacent process memory to the attacker-controlled parsing path. Depending on memory layout, the read can also destabilize control-flow structures used later by the image handler, opening a path to arbitrary code execution.

Exploitation is local and requires user interaction. An attacker must deliver a crafted VI file and get a LabVIEW user to open it. Impact is bounded to the privileges of the user running LabVIEW.

Root Cause

The root cause is an improper integer conversion, categorized as [CWE-195]. A width or signedness mismatch between values used to size or index the image buffer allows attacker-controlled fields in the VI file to bypass bounds checks. The resulting read operation crosses the intended buffer boundary.

Attack Vector

The attack vector is local with user interaction. An attacker crafts a VI file that embeds malformed image metadata. Delivery occurs through email, shared engineering repositories, USB media, or collaboration platforms used by LabVIEW developers. Opening the file in a vulnerable LabVIEW build triggers the flawed parser.

No verified public exploit code is available for CVE-2026-18444. Refer to the NI Security Update Advisory for vendor technical details.

Detection Methods for CVE-2026-18444

Indicators of Compromise

Unexpected LabVIEW process crashes or hangs immediately after opening a VI file from an external source
VI files received from untrusted senders or downloaded from non-corporate repositories
LabVIEW child processes spawning command interpreters such as cmd.exe, powershell.exe, or wscript.exe
Unusual outbound network connections initiated by LabVIEW.exe shortly after file open events

Detection Strategies

Hunt for process telemetry showing LabVIEW.exe as the parent of scripting or shell binaries
Monitor file-access events for VI files opened from user download directories or email attachment paths
Flag LabVIEW crash events correlated with recently opened VI files for analyst review

Monitoring Recommendations

Ingest endpoint process, file, and network telemetry from engineering workstations into a centralized data lake
Alert on LabVIEW installations that are not on the patched build and are actively opening external VI files
Track EPSS movement for CVE-2026-18444 to reprioritize as exploitation likelihood changes

How to Mitigate CVE-2026-18444

Immediate Actions Required

Inventory all systems running NI LabVIEW 2026 Q3 or earlier and prioritize patching engineering and test workstations
Instruct LabVIEW users to open VI files only from trusted, verified sources
Restrict LabVIEW execution to standard user accounts to limit impact of code execution

Patch Information

NI has published guidance in the NI Security Update Advisory. Apply the vendor-supplied update for NI LabVIEW that addresses the integer conversion flaw in the image-loading path. Validate the installed version against the fixed build listed by NI after applying the update.

Workarounds

Block inbound VI files at email and web gateways when senders or sources are not on an approved list
Store shared VI files in access-controlled repositories with integrity checks before distribution
Use application allowlisting to prevent LabVIEW from launching unexpected child processes such as shells or scripting hosts

bash

# Configuration example
# Windows: enumerate installed LabVIEW versions to identify vulnerable hosts
reg query "HKLM\SOFTWARE\National Instruments\LabVIEW" /s /v "Version"