CVE-2026-35226: Codesys Profinet

Medium severity, CVSS 6.5. EPSS: 0.3% chance of exploitation in the next 30 days.

An out‑of‑bounds write vulnerability in the CODESYS PROFINET Controller allows an unauthenticated attacker on the same network segment to send malformed PROFINET communication data that triggers an exception in the affected PLC application. The exception is handled by the CODESYS Control runtime system and results in a controlled stop of the PLC application.

Affected products

• Codesys Codesys Profinet: from 4.4.0.0, before 4.8.0.0 (fixed in 4.8.0.0)

Published 2026-07-29. Last modified 2026-07-30.