CVE-2026-15690 open62541 Shared Client ua_client_connect.c responseReadNamespacesArray null pointer dereference
Remote attackers can cause a denial of service in open62541 via a null pointer dereference in the shared client library.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-15690?
CVE-2026-15690 is a low-severity vulnerability in open62541, published on 14 Jul 2026. Any signed-in user can exploit it over the network, with no action from the victim.
Official description
A vulnerability was identified in open62541 up to 1.5.5. Affected by this issue is the function responseReadNamespacesArray of the file src/client/ua_client_connect.c of the component Shared Client Library. Such manipulation of the argument Server_NamespaceArray leads to null pointer dereference. The attack can be executed remotely. The attack requires a high level of complexity. The exploitation is known to be difficult. The exploit is publicly available and might 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-2026-15690?
How do I fix CVE-2026-15690?
No fix has been published for CVE-2026-15690 yet. Limit exposure of the affected software until one is available.
Is CVE-2026-15690 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-15690 exists.
Sources
Also known as DEBIAN-CVE-2026-15690, GHSA-cfxc-8gpx-qrvw, UBUNTU-CVE-2026-15690.