CVE-2026-43840
License Manager Service NULL Pointer Dereference
Description
A NULL pointer dereference vulnerability in the license manager service could allow an unauthenticated attacker to crash the service via the on_disconnected callback function.
INFO
Published Date :
Oct. 20, 2026, 9:17 a.m.
Last Modified :
Oct. 20, 2026, 9:17 a.m.
Remotely Exploit :
Yes !
Source :
5f57b9bf-260d-4433-bf07-b6a79e9bb7d4
CVSS Scores
| Score | Version | Severity | Vector | Exploitability Score | Impact Score | Source |
|---|---|---|---|---|---|---|
| CVSS 4.0 | MEDIUM | 5f57b9bf-260d-4433-bf07-b6a79e9bb7d4 | ||||
| CVSS 4.0 | MEDIUM | 5f57b9bf-260d-4433-bf07-b6a79e9bb7d4 |
Solution
- Apply vendor patches for the license manager service.
- Update the license manager service to the latest version.
- Validate input to the on_disconnected callback function.
- Ensure proper error handling for disconnected events.
References to Advisories, Solutions, and Tools
Here, you will find a curated list of external links that provide in-depth
information, practical solutions, and valuable tools related to
CVE-2026-43840.
| URL | Resource |
|---|---|
| https://www.advantech.com/en/security-advisory | |
| https://www.csa.gov.sg/alerts-and-advisories/alerts/al-2026-149 |
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2026-43840 is
associated with the following CWEs:
Common Attack Pattern Enumeration and Classification (CAPEC)
Common Attack Pattern Enumeration and Classification
(CAPEC)
stores attack patterns, which are descriptions of the common attributes and
approaches employed by adversaries to exploit the CVE-2026-43840
weaknesses.
We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).
Results are limited to the first 15 repositories due to potential performance issues.
The following list is the news that have been mention
CVE-2026-43840 vulnerability anywhere in the article.
The following table lists the changes that have been made to the
CVE-2026-43840 vulnerability over time.
Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.
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New CVE Received by 5f57b9bf-260d-4433-bf07-b6a79e9bb7d4
Oct. 20, 2026
Action Type Old Value New Value Added Description A NULL pointer dereference vulnerability in the license manager service could allow an unauthenticated attacker to crash the service via the on_disconnected callback function. Added CVSS V4.0 AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X Added Affected New affected value received. <a href="https://github.com/CVEProject/cvelistV5/blob/main/cves/2026/43xxx/CVE-2026-43840.json">CVE-2026-43840</a> Added Reference https://www.advantech.com/en/security-advisory Added Reference https://www.csa.gov.sg/alerts-and-advisories/alerts/al-2026-149