---
id: CVE-2026-103416
title: "Out-of-bounds write via the TLS 1.3 handshake message cache in NetX Duo in Eclipse ThreadX NetX Duo\_6.5.1.202602 allows a handshake message larger than the cache writes past it and on into the rest of the session control block, which hol…"
summary: "Out-of-bounds write via the TLS 1.3 handshake message cache in NetX Duo in Eclipse ThreadX NetX Duo\_6.5.1.202602 allows a handshake message larger than the cache writes past it and on into the rest of the session control block, which hol…"
severity: critical
cvss: 9.3
cvssVector: 'CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N'
cwe:
  - CWE-787
vendor: Eclipse Foundation
product: Eclipse ThreadX - NetX Duo
affected:
  - eclipse_threadx_-_netx_duo <= 6.5.1.202602
published: '2026-10-07'
updated: '2026-10-07'
sourceUpdated: '2026-10-07T09:17:04.647'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-103416'
references:
  - url: >-
      https://github.com/eclipse-threadx/netxduo/security/advisories/GHSA-4x76-j955-qhq2
    label: emo@eclipse.org
  - url: 'https://gitlab.eclipse.org/security/cve-assignment/-/work_items/356'
    label: emo@eclipse.org
tags:
  - nvd
  - cve.org
cvssSource: cna
ingestedAt: '2026-10-07T09:22:30.525Z'
---

## Overview

Out-of-bounds write via the TLS 1.3 handshake message cache in NetX Duo in Eclipse ThreadX NetX Duo 6.5.1.202602 allows a handshake message larger than the cache writes past it and on into the rest of the session control block, which holds pointers. A malicious or compromised server can make a TLS 1.3 client produce such a message before certificate authentication completes, so no server certificate is needed to reach it.

## Remediation

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