{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-54156", "assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa", "state": "PUBLISHED", "assignerShortName": "GitHub_M", "dateReserved": "2026-06-11T21:15:33.872Z", "datePublished": "2026-09-14T16:09:07.744Z", "dateUpdated": "2026-09-14T16:35:48.958Z"}, "containers": {"cna": {"title": "node-opcua: Unbounded nonce cache enables unauthenticated heap exhaustion DoS", "problemTypes": [{"descriptions": [{"cweId": "CWE-770", "lang": "en", "description": "CWE-770: Allocation of Resources Without Limits or Throttling", "type": "CWE"}]}], "metrics": [{"cvssV3_1": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "HIGH", "baseScore": 7.5, "baseSeverity": "HIGH", "confidentialityImpact": "NONE", "integrityImpact": "NONE", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H", "version": "3.1"}}], "references": [{"name": "https://github.com/node-opcua/node-opcua/security/advisories/GHSA-6wvw-vrw4-363w", "tags": ["x_refsource_CONFIRM"], "url": "https://github.com/node-opcua/node-opcua/security/advisories/GHSA-6wvw-vrw4-363w"}, {"name": "https://github.com/node-opcua/node-opcua/commit/b82c2939fe9c658de58da993f2798ec5481d7313", "tags": ["x_refsource_MISC"], "url": "https://github.com/node-opcua/node-opcua/commit/b82c2939fe9c658de58da993f2798ec5481d7313"}, {"name": "https://github.com/node-opcua/node-opcua/releases/tag/v2.166.0", "tags": ["x_refsource_MISC"], "url": "https://github.com/node-opcua/node-opcua/releases/tag/v2.166.0"}], "affected": [{"vendor": "node-opcua", "product": "node-opcua", "versions": [{"version": "< 2.166.0", "status": "affected"}]}], "providerMetadata": {"orgId": "a0819718-46f1-4df5-94e2-005712e83aaa", "shortName": "GitHub_M", "dateUpdated": "2026-09-14T16:09:07.744Z"}, "descriptions": [{"lang": "en", "value": "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."}], "source": {"advisory": "GHSA-6wvw-vrw4-363w", "discovery": "UNKNOWN"}}, "adp": [{"metrics": [{"other": {"type": "ssvc", "content": {"timestamp": "2026-09-14T16:35:36.222019Z", "id": "CVE-2026-54156", "options": [{"Exploitation": "none"}, {"Automatable": "yes"}, {"Technical Impact": "partial"}], "role": "CISA Coordinator", "version": "2.0.3"}}}], "title": "CISA ADP Vulnrichment", "providerMetadata": {"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2026-09-14T16:35:48.958Z"}}]}}

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