# CVE-2026-82945: SOEM buffer overflow in device configuration

Source: https://junglewise.ai/threats/cve-2026-82945-soem-version-2-0-0-and-earlier-contains-a-vulnerability-during  
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-2026-82945 · Severity: medium · CVSS 6.5 · Published 2026-10-26

SOEM is an open-source EtherCAT protocol library used in industrial automation and real-time control systems. A malicious industrial device can trigger a buffer overflow during configuration handshake, corrupting memory and potentially disrupting operations or executing code on systems that connect to it.

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

## Quick answers

**Is CVE-2026-82945 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-82945 being exploited in the wild.

**How severe is CVE-2026-82945?** Medium severity, with a CVSS score of 6.5, published 26 October 2026.

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

**Is there a fix for CVE-2026-82945?** 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-2026-82945 attacked?** It is attacked from the adjacent network, in a software library.

**Am I affected by CVE-2026-82945?** 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 version 2.0.0 and earlier fails to bounds-check array indices when writing device configuration data to a fixed-size array of EC_MAXFMMU entries. A device presenting more than EC_MAXFMMU configuration blocks can write beyond the array boundary, corrupting adjacent memory structures. Exploitation requires a malicious or compromised device on the EtherCAT network; no authentication is required but network adjacency is assumed.

## 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 buffer over-read in frame processing](https://junglewise.ai/threats/cve-2026-82947-soem-version-2-0-0-and-earlier-contains-multiple-vulnerabilities)
- [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 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)