CVE-2026-67870 Null dereference in n/a
A remote attacker can cause a denial of service in open62541 by sending a crafted AddReferencesRequest that triggers a null pointer dereference.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-67870?
CVE-2026-67870 is a critical vulnerability in n/a, published on 5 Aug 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
In open62541 v1.5.5, the server-side AddReferences implementation contains an incomplete validation flaw for non-local ExpandedNodeId targets. A remote attacker can send a crafted AddReferencesRequest with an empty targetServerUri and a non-zero targetNodeId.serverIndex, causing the target node pointer to remain NULL while execution continues.
Weakness: CWE-476
Which versions are affected by CVE-2026-67870?
How do I fix CVE-2026-67870?
No fix has been published for CVE-2026-67870 yet. Limit exposure of the affected software until one is available.
Is CVE-2026-67870 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-67870 exists.
Sources
Also known as DEBIAN-CVE-2026-67870, GHSA-3jmw-8hr3-2j76, UBUNTU-CVE-2026-67870.