---
id: CVE-2026-70388
title: Memory Corruption via Integer Underflow in Message Length Validation
summary: >-
  SOEM version 2.0.0 and earlier contains vulnerabilities where a malicious
  device on the network can send specially crafted messages that cause the
  master to write data outside allocated memory boundaries. The software
  performs arithmetic…
severity: high
cvss: 8.3
cvssVector: 'CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:L/I:H/A:H'
cvssSource: cna
cwe:
  - CWE-191
  - CWE-195
  - CWE-787
vendor: RT-Labs AB
product: SOEM
affected:
  - SOEM < 2.0.1
published: '2026-10-26'
updated: '2026-10-26'
sourceUpdated: '2026-10-26T08:34:24.036Z'
source: CVEORG
sourceUrl: 'https://www.cve.org/CVERecord?id=CVE-2026-70388'
references:
  - url: 'https://rt-labs.com/wp-content/uploads/2026/10/RRTL-260921-01.pdf'
tags:
  - cve.org
ingestedAt: '2026-10-26T09:22:35.525Z'
---

## Overview

SOEM version 2.0.0 and earlier contains vulnerabilities where a malicious device on the network can send specially crafted messages that cause the master to write data outside allocated memory boundaries. The software performs arithmetic on message length values without proper validation, allowing negative or extremely large values to bypass safety checks. This can corrupt memory and potentially allow an attacker to execute arbitrary code on the master system.

## Affected

- `SOEM < 2.0.1`

## Remediation

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