RCE in widely-used SOEM EtherCAT master library can compromise industrial controllers and disrupt OT operations across multiple sectors.
CVE-2026-70388
Crafted EtherCAT messages cause OOB writes in SOEM master, enabling remote RCE.
Is CVE-2026-70388 being exploited?
Not confirmed. CVE-2026-70388 does not appear in CISA's Known Exploited Vulnerabilities catalog, which records only exploitation that has been observed and reported publicly. That is evidence of absence of a report, not evidence the flaw is unattacked.
How severe is CVE-2026-70388?
CVE-2026-70388 is rated High with a CVSS score of 8.3. Severity describes how bad exploitation would be, not how likely it is: pair it with exploitation evidence before deciding what to patch first.
Is there a patch for CVE-2026-70388?
Not known from our data. No patch reference has been recorded for CVE-2026-70388, which is not the same as no patch existing — a fix may have shipped without a tagged reference, or after this record was written. The vendor advisory is the only authority on whether a fix exists, and mitigations may be available regardless.
What does CVE-2026-70388 affect?
CVE-2026-70388 affects SOEM (<= 2.0.0), EtherCAT masters using SOEM, Industrial controllers/systems embedding SOEM. Confirm the exact affected versions against the vendor advisory before deciding you are exposed.
What should I do about CVE-2026-70388?
Isolate EtherCAT networks, block untrusted devices, apply vendor fixes when available
Exploitation status reflects CISA's KEV catalog as we last synced it. Check the catalog directly.
Remote code execution on EtherCAT master via crafted messages causing out-of-bounds writes; attacker can take control of OT systems or disrupt operations.
Immediate action required
- affected< 2.0.1
As published in the CVE Program record. A version outside these ranges is not a statement that it is unaffected — vendors sometimes understate a range, and distribution-backported builds carry upstream numbers that do not reflect what was patched into them.