Vulnerability · Published Nov 3, 2026 · Assigned by GitHub_M
CVE-2026-95860node-opcua: Namespace-Level RBAC Fail-Open - Anonymous Write/Call Bypass via Unbound `DefaultRolePermissions
Critical 9.1
In plain English
A critical-severity incorrect authorization in node-opcua from node-opcua. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 0.6% (higher than 49% of all known vulnerabilities).
Official description
node-opcua is an OPC UA implementation for TypeScript and Node.js. From 2.42.0 until 2.180.0, namespace-level access control configured through setDefaultRolePermissions is not honored by the runtime enforcement path for nodes without explicit per-node RolePermissions. SessionContext.getApplicableRolePermissions reads a missing or null DefaultRolePermissions metadata value instead of the configured namespace field, and the null result is treated permissively. An anonymous network client can consequently write variables with CurrentWrite access or call bound methods when an operator configured a restrictive namespace default and relied on inheritance. Servers with no declared policy, nodes with explicit per-node permissions, and correctly bound programmatic namespace metadata are outside the authorization-bypass case. This issue is fixed in version 2.180.0.
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| node-opcua | node-opcua | >= 2.42.0, < 2.180.0 |
Weakness: CWE-285, CWE-636, CWE-863, CWE-1188 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N
References
- https://github.com/node-opcua/node-opcua/security/advisories/GHSA-xggf-m53x-jc3f x_refsource_CONFIRM
- https://github.com/node-opcua/node-opcua/pull/1580 x_refsource_MISC
- https://github.com/node-opcua/node-opcua/commit/0261e873900800983c622e01120f484dc6063698 x_refsource_MISC
- https://github.com/node-opcua/node-opcua/releases/tag/v2.180.0 x_refsource_MISC