---
id: CVE-2026-92843
title: >-
  Out-of-bounds Read via the TLS 1.3 Certificate extensions_length in NetX
  Secure
summary: >-
  A missing bounds check in the TLS 1.3 Certificate-message parser of NetX
  Secure lets a malicious TLS 1.3 server trigger an unsigned-integer underflow
  and a subsequent heap out-of-bounds read in any peer that processes a remote
  Certificat…
severity: high
cvss: 8.7
cvssVector: 'CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N'
cvssSource: cna
cwe:
  - CWE-125
vendor: Eclipse Foundation
product: NetX Duo
affected:
  - netx_duo <= 6.5.1.202602
ssvc:
  exploitation: none
  automatable: 'yes'
  technicalImpact: partial
  timestamp: '2026-10-20T17:08:26.088209Z'
published: '2026-10-20'
updated: '2026-10-20'
sourceUpdated: '2026-10-20T17:08:35.381Z'
source: CVEORG
sourceUrl: 'https://www.cve.org/CVERecord?id=CVE-2026-92843'
references:
  - url: >-
      https://github.com/eclipse-threadx/netxduo/security/advisories/GHSA-4m85-f9qh-q3jv
tags:
  - cve.org
ingestedAt: '2026-10-20T16:10:53.320Z'
---

## Overview

A missing bounds check in the TLS 1.3 Certificate-message parser of NetX Secure lets a malicious TLS 1.3 server trigger an unsigned-integer underflow and a subsequent heap out-of-bounds read in any peer that processes a remote Certificate message. It is reachable pre-authentication, during the normal handshake, before certificate verification completes.

## Affected

- `netx_duo <= 6.5.1.202602`

## Remediation

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