---
id: "CVE-2026-43840"
kind: "vulnerability"
aliases: ["CVE-2026-43840"]
title: "License manager service crashes via NULL pointer in disconnect callback"
severity: "medium"
cvss: 6.9
epss: null
exploited: false
status: "open"
category: "other"
products: []
ecosystems: []
tags: ["license-manager", "other"]
not_affected_if: []
published_at: "2026-10-20T09:17:10+00:00"
first_seen_at: "2026-10-23T21:57:20+00:00"
updated_at: "2026-10-25T03:40:35+00:00"
sources: [{"source": "nvd", "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-43840", "first_seen_at": "2026-10-23T21:57:20+00:00"}]
---

# License manager service crashes via NULL pointer in disconnect callback

A NULL pointer dereference in the license manager service's on_disconnected callback lets an unauthenticated attacker crash the service. The sources describe only a denial of service, not code execution or data access.

_Summary, check and fix written by a model from the sources; labelled as such._

## How to check

- unknown

## Fix

- unknown

## Timeline

- 2026-10-23T21:57:20+00:00 nvd https://nvd.nist.gov/vuln/detail/CVE-2026-43840

## From the sources

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.

---

_Free to read at a human pace. An API with keys and an MCP server are in preparation; early access: hello@infrastack.ai_