CVE-2026-78012
Buffer overflow in NetStaX EtherNet/IP stack allows device crash or possible remote code execution.
Is CVE-2026-78012 being exploited?
Not confirmed. CVE-2026-78012 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. EPSS currently estimates a 0.47% probability of exploitation in the next 30 days.
How severe is CVE-2026-78012?
CVE-2026-78012 is rated Critical with a CVSS score of 9.3. 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-2026-78012?
Yes. A fix has been recorded for CVE-2026-78012. The vendor advisory is the authority on the exact fixed version — apply it from there rather than from a summary.
What does CVE-2026-78012 affect?
CVE-2026-78012 affects NetStaX EtherNet/IP Stack < v5.6.1, Industrial controllers/PLCs/RTUs embedding NetStaX, Vendor devices using NetStaX stack. Confirm the exact affected versions against the vendor advisory before deciding you are exposed.
What should I do about CVE-2026-78012?
Upgrade to NetStaX v5.6.1; block/inspect EtherNet/IP Class 3 traffic; isolate affected ICS devices.
Exploitation status reflects CISA's KEV catalog as we last synced it. Check the catalog directly.
Oversized Class 3 explicit-message can overflow receive buffer, causing memory corruption, device crash, or potential remote code execution.
Immediate action required
- affected<= v5.6.1
- affected<= v5.6.1
- affected<= v5.6.1
- affected<= v5.6.1
- affected<= v5.6.1
- affected< v5.6.1
- affected<= v5.6.1
- affected<= v5.6.1
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.