CVE-2026-67870
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.
Does this matter?
High impact if exploited, but EPSS currently rates exploitation as unlikely (0.57%). Schedule it in the normal patch cycle and watch for a rise in EPSS or a public exploit.
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.
- CVSS 3.1
- 9.8 CRITICALCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
- EPSS
- 0.57% probability · 45th percentile
- CISA KEV
- Not listed
- Weakness
- CWE-476
- Source
- cve@mitre.org
References
- https://github.com/open62541/open62541/blob/v1.5.5/include/open62541/types.h
- https://github.com/open62541/open62541/blob/v1.5.5/src/server/ua_services_nodemanagement.c
- https://github.com/open62541/open62541/blob/v1.5.5/src/ua_types.c
- https://github.com/open62541/open62541/issues/8172
- https://github.com/open62541/open62541/issues/8172
Source: NVD record, EPSS from FIRST.org, KEV from CISA. Refreshed daily.