# CVE-2026-82947: SOEM buffer over-read in frame processing

Source: https://junglewise.ai/threats/cve-2026-82947-soem-version-2-0-0-and-earlier-contains-multiple-vulnerabilities  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-10-26. Updated: 2026-10-26  
License: CC BY 4.0 with a link back

CVE-2026-82947 · Severity: high · CVSS 7.1 · Published 2026-10-26

SOEM is an EtherCAT master library used in industrial and embedded systems to communicate with field devices. A malicious EtherCAT device can exploit insufficient validation of frame data to cause the SOEM master to read from memory locations outside its allocated buffers, potentially exposing sensitive information or crashing the application.

Technologies: [RT-Labs SOEM](https://junglewise.ai/threats/technologies/soem). Vendors: [RT-Labs](https://junglewise.ai/threats/vendors/rt-labs).

## Quick answers

**Is CVE-2026-82947 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-82947 being exploited in the wild.

**How severe is CVE-2026-82947?** High severity, with a CVSS score of 7.1, published 26 October 2026.

**Which products and versions are affected?** RT-Labs SOEM 2.0.0 and earlier.

**Is there a fix for CVE-2026-82947?** No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.

**How is CVE-2026-82947 attacked?** It is attacked over the network or from the adjacent network, in a software library.

**Am I affected by CVE-2026-82947?** Check whether you run RT-Labs SOEM at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

## Technical details

SOEM versions 2.0.0 and earlier fail to validate length and offset values extracted from EtherCAT device messages before using them to read from buffers. An attacker controlling a malicious EtherCAT slave device can craft frames with out-of-bounds length or offset values, causing the master to perform out-of-bounds reads. This can lead to information disclosure or denial of service.

## Affected products

- RT-Labs SOEM 2.0.0 and earlier

## Timeline

- 2026-10-26: disclosed

## References

- [https://rt-labs.com/wp-content/uploads/2026/10/RRTL-260921-01.pdf](https://rt-labs.com/wp-content/uploads/2026/10/RRTL-260921-01.pdf)

## Related threats

- [SOEM use-after-free in message handling](https://junglewise.ai/threats/cve-2026-82946-soem-version-2-0-0-and-earlier-contains-a-vulnerability-where-a)
- [SOEM buffer overflow in device configuration](https://junglewise.ai/threats/cve-2026-82945-soem-version-2-0-0-and-earlier-contains-a-vulnerability-during)
- [SOEM multi-segment data transfer buffer overflow](https://junglewise.ai/threats/cve-2026-82944-soem-version-2-0-0-and-earlier-contains-a-vulnerability-in-multi)
- [SOEM buffer over-read via unvalidated device messages](https://junglewise.ai/threats/cve-2026-82943-soem-version-2-0-0-and-earlier-contains-vulnerabilities-where-a)
- [SOEM buffer overflow via malformed network messages](https://junglewise.ai/threats/cve-2026-70388-soem-version-2-0-0-and-earlier-contains-vulnerabilities-where-a)