What’s Vulnerable › Vulnerabilities
CVE-2026-35226: Out-of-bounds Write in CODESYS PROFINET Controller
- Severity: medium (CVSS 6.5 v3.1)
- Exploited in the wild: not listed in CISA KEV
- EPSS: 0.3% probability of exploitation in the next 30 days
- Public exploit or detection template: none known
- Published: 2026-07-29 · updated 2026-10-23
- Weakness: CWE-787
Description
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 PROFINET: from 4.4.0.0 before 4.8.0.0 — fixed in 4.8.0.0
How to fix
Upgrade to a fixed version: CODESYS PROFINET 4.8.0.0. Check the vendor advisory for mitigations.
References
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