CVE-2026-54156High· 7.5▾ Twilightnode-opcua is an OPC UA implementation for TypeScript and Node.js. Prior to 2.166.0, the process-global g_alreadyUsedNonce cache used by nonceAlreadyBeenUsed in packages/node-opcua-secure-channel/source/server/server_secure_channel_layer…
▾ Twilight zone — High severity, or a signal on a lesser flaw
impact 41.3 · likelihood 0.1 · exploitation 0
Need a working PoC? Pro members can cast a request and our team develops one — it lands right here.
Stakeholder-Specific Vulnerability Categorization from CISA's ADP record at CVE.org: whether exploitation is observed, whether an attack can be automated, and how much of the system is at stake.
Exploit-prediction probability, daily snapshots since Sep 15.
Disclosure to exploitation, from the record and what we observed since indexing it.
Disclosed via NVD
0.5%
node-opcua is an OPC UA implementation for TypeScript and Node.js. Prior to 2.166.0, the process-global g_alreadyUsedNonce cache used by nonceAlreadyBeenUsed in packages/node-opcua-secure-channel/source/server/server_secure_channel_layer.ts records nonces from OpenSecureChannelRequest and CreateSession without expiration or a size limit. An unauthenticated remote attacker can repeatedly create sessions with unique nonces, causing entries to persist after session expiry and accumulate across connection cycles even when maxSessions=10 limits concurrent sessions. The resulting unbounded heap growth can exhaust the default Node.js heap and crash the node-opcua server process. This issue is fixed in version 2.166.0.
Refer to the linked advisories for vendor-supplied fixes and affected version ranges.
Affected packages:
node-opcua <= 2.165.0Patched in:
node-opcua 2.168.0Connected by shared product, vendor, weakness, or advisory.
CVE-2026-54155High· 7.7node-opcua is an OPC UA implementation for TypeScript and Node.js
CVE-2026-69200Low· 3.7node-opcua is an OPC UA implementation for TypeScript and Node.js
CVE-2025-61726High· 7.5The net/url package does not set a limit on the number of query parameters in a query
CVE-2026-16100Medium· 6.5A flaw was found in the user-event metrics recording of Keycloak
CVE-2025-11362High· 7.5Versions of the package pdfmake from 0.3.0-beta.1 and before 0.3.0-beta.17 are vulnerable to Allocation of Resources Without Limits or Throttling via repeatedly redirect URL in file embedding
CVE-2023-5379High· 7.5A flaw was found in Undertow