CVE-2026-35226 Out-of-bounds Write in CODESYS PROFINET Controller
An unauthenticated attacker can cause a denial of service by sending malformed PROFINET data to trigger an out-of-bounds write and stop the PLC application.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Local or same network only
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-35226?
CVE-2026-35226 is a high-severity memory corruption vulnerability in CODESYS PROFINET, published on 29 Jul 2026. It can only be exploited from the same machine or local network, with no action from the victim.
Official 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.
Weakness: CWE-787
Which versions are affected by CVE-2026-35226?
How do I fix CVE-2026-35226?
No fix has been published for CVE-2026-35226 yet. Limit exposure of the affected software until one is available.
Upgrade to the fixed version. Memory-safe languages, compiler hardening and fuzzing prevent most new cases. More about Memory corruption.
Is CVE-2026-35226 being exploited?
There is no known exploitation of CVE-2026-35226 in the wild and no public exploit code.
Sources
Also known as GHSA-jxhr-7f6w-54g7.