---
id: CVE-2026-94018
title: >-
  NetX Duo Web HTTP server releases an uninitialized packet pointer on the PUT
  Content-Length underflow path
summary: >-
  The Web add-on's HTTP server dereferences and releases an uninitialized
  pointer when it detects a `Content-Length` underflow while processing a `PUT`
  request. The condition is reachable by an unauthenticated remote client with a
  single m…
severity: high
cvss: 8.8
cvssVector: 'CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:L/VA:H/SC:N/SI:N/SA:N'
cvssSource: cna
cwe:
  - CWE-457
  - CWE-824
vendor: Eclipse Foundation
product: NetX Duo
affected:
  - netx_duo >= 6.4.2 <= 6.5.1.202602
ssvc:
  exploitation: none
  automatable: 'yes'
  technicalImpact: partial
  timestamp: '2026-10-20T17:03:12.318553Z'
published: '2026-10-20'
updated: '2026-10-20'
sourceUpdated: '2026-10-20T17:03:21.440Z'
source: CVEORG
sourceUrl: 'https://www.cve.org/CVERecord?id=CVE-2026-94018'
references:
  - url: >-
      https://github.com/eclipse-threadx/netxduo/security/advisories/GHSA-wjxf-gjm5-jh5q
tags:
  - cve.org
ingestedAt: '2026-10-20T16:10:53.330Z'
---

## Overview

The Web add-on's HTTP server dereferences and releases an uninitialized pointer when it detects a `Content-Length` underflow while processing a `PUT` request. The condition is reachable by an unauthenticated remote client with a single malformed request.

## Affected

- `netx_duo >= 6.4.2 <= 6.5.1.202602`

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.