CVE-2026-18784 o6 open62541 ua_client_highlevel.c UA_Client_readNodeClassAttribute heap-based overflow
A heap-based buffer overflow in open62541 allows local attackers to execute arbitrary code or cause denial of service.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Local or same network only
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-18784?
CVE-2026-18784 is a medium-severity memory corruption vulnerability in o6 open62541, published on 4 Aug 2026. It can only be exploited from the same machine or local network, with no action from the victim.
Official description
A vulnerability was found in o6 open62541 up to 1.5.5. This issue affects the function UA_Client_readNodeClassAttribute of the file src/client/ua_client_highlevel.c. Performing a manipulation results in heap-based buffer overflow. Attacking locally is a requirement. The exploit has been made public and could be used. The project closed the issue report, stating that this is not the official way to report a security vulnerability.
Which versions are affected by CVE-2026-18784?
How do I fix CVE-2026-18784?
No fix has been published for CVE-2026-18784 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-2026-18784 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-18784 exists.
Sources
Also known as DEBIAN-CVE-2026-18784, GHSA-r2hr-h3px-675c, UBUNTU-CVE-2026-18784.