---
id: "CVE-2026-82947"
kind: "vulnerability"
aliases: ["CVE-2026-82947"]
title: "SOEM: frame processing trusts device lengths, reads past buffers"
severity: "high"
cvss: 7.1
epss: null
exploited: false
status: "open"
category: "other"
products: []
ecosystems: []
tags: ["embedded", "ethercat", "industrial-control", "other", "robotics", "soem"]
not_affected_if: ["no-untrusted-devices-on-bus"]
published_at: "2026-10-26T09:16:36+00:00"
first_seen_at: "2026-10-26T09:29:16+00:00"
updated_at: "2026-10-26T09:30:52+00:00"
sources: [{"source": "nvd", "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-82947", "first_seen_at": "2026-10-26T09:29:16+00:00"}]
---

# SOEM: frame processing trusts device lengths, reads past buffers

SOEM, an EtherCAT master library, uses length and offset values from device frames without checking them against buffer sizes. A malicious EtherCAT device can make the master read outside its buffers, leaking memory contents or crashing the process.

_Summary, check and fix written by a model from the sources; labelled as such._

## How to check

- Check the installed SOEM version; the sources say versions `2.0.0` and earlier are affected.
- unknown for other checks; the sources do not describe a specific setting or file to inspect.

## Fix

- Move to a SOEM release newer than `2.0.0`; the sources do not name the fixed version.
- unknown for other actions; the sources do not give a mitigation.

## Timeline

- 2026-10-26T09:29:16+00:00 nvd https://nvd.nist.gov/vuln/detail/CVE-2026-82947

## From the sources

SOEM version 2.0.0 and earlier contains multiple vulnerabilities in frame processing where a malicious device can cause the master to read data outside allocated buffers. The software uses length and offset values from device messages without validating them against buffer sizes. This can cause the master to access invalid memory locations, potentially disclosing sensitive information or causing crashes.

---

_Free to read at a human pace. An API with keys and an MCP server are in preparation; early access: hello@infrastack.ai_