---
id: CVE-2026-102712
title: >-
  On the first DTLS ClientHello, the parser copies a device-claimed session_id
  length and validates the




  ciphersuite-list length against the total record length instead of the
  remaining bytes
summary: >-
  On the first DTLS ClientHello, the parser copies a device-claimed session_id
  length and validates the




  ciphersuite-list length against the total record length instead of the
  remaining bytes. An unauthenticated




  peer drives an OOB sou…
severity: high
cvss: 8.8
cvssVector: 'CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:N/VA:H/SC:N/SI:N/SA:N'
cwe:
  - CWE-125
vendor: Eclipse Foundation
product: NetX Duo
affected:
  - netx_duo <= 6.5.1.202602
published: '2026-09-29'
updated: '2026-09-29'
sourceUpdated: '2026-09-29T18:17:10.320'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-102712'
references:
  - url: >-
      https://github.com/eclipse-threadx/netxduo/security/advisories/GHSA-5xr3-wpxf-rw5q
    label: emo@eclipse.org
tags:
  - nvd
  - cve.org
cvssSource: cna
ingestedAt: '2026-09-29T18:42:35.813Z'
---

## Overview

On the first DTLS ClientHello, the parser copies a device-claimed session_id length and validates the



ciphersuite-list length against the total record length instead of the remaining bytes. An unauthenticated



peer drives an OOB source read of up to 255 bytes, and those bytes are echoed verbatim into the outgoing



ServerHello, disclosing adjacent process memory over the network. The crash variant fires on the first



packet.

## Remediation

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