LabVIEW: Signed to Unsigned Conversion Error
CVE-2026-18444 is a high-severity signed to unsigned conversion error vulnerability in LabVIEW from NI, with a CVSS 3.1 base score of 7.8 out of 10. It can be exploited with local access to the system by an unauthenticated attacker, but only if a user takes part, for example by opening a link or file. The record lists versions 23.0.0, 23.3.10, 24.3.7 as the first without the flaw, so updating LabVIEW to one of those releases or later removes the exposure. There is no confirmed exploitation so far. EPSS estimates a 0.18% chance of exploitation within 30 days, which is low compared with other CVEs.
High severity with no evidence of exploitation so far.
What to do
- Update LabVIEW to 23.0.0 or 23.3.10 or 24.3.7 or 25.3.5, whichever matches your release line, or a later version.
- Read the advisory on ni.com for workarounds and exact fixed builds.
- Because the attack needs a user to take part, warn users about unexpected links and files related to this product until it is patched.
Affected products and versions
| Vendor | Product | Affected versions | Fixed in |
|---|---|---|---|
| NI | LabVIEW | before 23.0.0; 23.1.0 up to, but not including, 23.3.10; 24.1.0 up to, but not including, 24.3.7; 25.1.0 up to, but not including, 25.3.5; 26.1.0 up to, but not including, 26.3.1 | 23.0.0, 23.3.10, 24.3.7, 25.3.5, 26.3.1 |
Version data comes from the organisation that assigned the CVE. Confirm against the vendor advisory before deciding you are unaffected.
How the severity score breaks down
- Attack vector
- LocalThe attacker needs local access or must trick a user into running something.
- Attack complexity
- LowNo special conditions are needed; the attack works reliably.
- Privileges required
- NoneNo account or login is needed.
- User interaction
- RequiredA user must take an action such as opening a file or link.
- Scope
- UnchangedImpact stays within the vulnerable component.
- Confidentiality
- HighAll data handled by the component can be read.
- Integrity
- HighData or code can be modified at will.
- Availability
- HighThe component can be taken down completely.
Vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H. Scored by NVD.
| Scoring system | Score | Severity | Scored by |
|---|---|---|---|
| CVSS 4.0 | 6.9 | Medium | CNA (ni.com) |
| CVSS 3.1 | 6.6 | Medium | CNA (ni.com) |
| CVSS 3.1 | 7.8 | High | NVD |
Official description
There is an integer conversion vulnerability resulting in an out-of-bounds read when loading images recently discovered in NI LabVIEW. This may result in information disclosure or arbitrary code execution. Successful exploitation requires an attacker to get a user to open a specially crafted VI file. This vulnerability affects NI LabVIEW 2026 Q3 and prior versions.
Source: the CVE record as published by its numbering authority, via NVD and CVE.org.
The underlying weakness: Signed to Unsigned Conversion Error
The product uses a signed primitive and performs a cast to an unsigned primitive, which can produce an unexpected value if the value of the signed primitive can not be represented using an unsigned primitive.
More Signed to Unsigned Conversion Error vulnerabilities (CWE-195)
Timeline
- CVE record published.
- CISA published its SSVC assessment (exploitation: none, automatable: no, technical impact: total).
- Record last changed materially (score, affected products, status or references).
References
Other vulnerabilities in LabVIEW
- 7.8 High severity
- 7.8 High severity
- 7.8 High severity
- 7.8 High severity
- 7.8 High severity
- 7.8 High severity
Recent Signed to Unsigned Conversion Error vulnerabilities
- 7.5 High severity
- 7.5 High severity
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