CVE-2026-54156: high-severity vulnerability in node-opcua
node-opcua: Unbounded nonce cache enables unauthenticated heap exhaustion DoS
Published
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21Vexday Risk Score
No sign of exploitation. No public exploitation artifact known so far.
ssvc Trackcvss 7.5epss 0.8%
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.
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Affected products
node-opcua · node-opcuaRelated CVEs — node-opcua
In the same product, most dangerous first.
CVE-2026-68904HIGHnode-opcua: TCP Socket Leak (FIN-WAIT-2) via keepalive reconnection cycle - Resource ExhaustionEPSS 0.4%CVE-2026-54155HIGHnode-opcua: Missing nonce verification in UserNameIdentityToken authenticationEPSS 0.4%CVE-2026-69200LOWnode-opcua: Prototype Pollution via internal `fieldsToJson()` implementation (Related to CVE-2024-57086)EPSS 0.3%CVE-2026-95860CRITICALnode-opcua: Namespace-Level RBAC Fail-Open - Anonymous Write/Call Bypass via Unbound `DefaultRolePermissionsEPSS —