CVE-2026-54156 node-opcua - Denial of Service

node-opcua prior to 2.166.0 contains a denial of service caused by unbounded nonce cache growth in server_secure_channel_layer.ts, letting unauthenticated remote attackers exhaust server memory, exploit requires repeated session creation with unique nonces.

CVSS base score 7.5 /10
High
CISA KEV
Not listed
Public exploit
None known
Authentication
Not required
EPSS
0.78% chance of exploitation in 30 days
View the NVD record ↗

Details

Type
Denial of Service
Impact
Denial Of Service
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Published
14 September 2026
Updated
15 October 2026
Weakness
CWE-770

Vendor fix

Update to version 2.166.0 or later.

Patching closes this CVE. It does not tell you which of your systems run the affected version, or what else is exposed alongside them.

References

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