# CVE-2026-82944: Buffer Overflow in CoE SDO Upload Multi-Segment Data Transfers

Status: published. Published: 2026-10-26. Updated: 2026-11-02.

SOEM version 2.0.0 and earlier contains a vulnerability in multi-segment data transfers where a malicious device can overflow memory buffers. The software checks the total size only once at the beginning, but doesn't track the cumulative size as multiple segments arrive. An attacker can declare a small initial size to pass validation, then send additional segments that exceed the allocated buffer. This allows the attacker to write controlled data beyond buffer boundaries, potentially enabling code execution.

## Remediation

No remediation reported in collected sources

## Affected products and versions

- RT-Labs AB / SOEM: ≥ 0; < 2.0.1 (affected, semver). Source: CNA: ENISA

## Severity and prioritization

- CVSS 3.1: 8.8 (high); CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H; source: CNA: ENISA

- CISA KEV: No listing in collected sources

- EPSS: 0.21% as of 2026-11-02; percentile 11.24%

- SSVC: exploitation none; automatable no; technical impact total; source ADP: CISA-ADP

- Weaknesses: CWE-787, CWE-131, CWE-120

## Exploit evidence

No exploit evidence in collected sources. This is not proof of no exploitation.

## References

- https://rt-labs.com/wp-content/uploads/2026/10/RRTL-260921-01.pdf (CNA: ENISA; vendor-advisory)

## Provenance

- CNA: ENISA: https://www.cve.org/CVERecord?id=CVE-2026-82944; retrieved 2026-11-02; source updated 2026-11-02

- FIRST EPSS: https://api.first.org/data/v1/epss?cve=CVE-2026-82944; retrieved 2026-11-02; source updated Not reported

Revision: 9d3723b7dfc0ae7226ef1dbfc030b2e03245bc0ae1f6854d8f4ad99fd16046bb

Canonical: https://y2.dev/cve/CVE-2026-82944

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