CVE-2026-54156

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{"affected": [{"affectedData": [{"product": "node-opcua", "vendor": "node-opcua", "versions": [{"status": "affected", "version": "< 2.166.0"}]}], "source": "security-advisories@github.com"}], "cveTags": [], "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."}], "id": "CVE-2026-54156", "lastModified": "2026-09-30T19:38:27.293", "metrics": {"cvssMetricV31": [{"cvssData": {"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"}, "exploitabilityScore": 3.9, "impactScore": 3.6, "source": "security-advisories@github.com", "type": "Secondary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-54156", "options": [{"exploitation": "none"}, {"automatable": "yes"}, {"technicalImpact": "partial"}], "role": "CISA Coordinator", "timestamp": "2026-09-14T16:35:36.222019Z", "version": "2.0.3"}}]}, "published": "2026-09-14T17:17:46.927", "references": [{"source": "security-advisories@github.com", "url": "https://github.com/node-opcua/node-opcua/commit/b82c2939fe9c658de58da993f2798ec5481d7313"}, {"source": "security-advisories@github.com", "url": "https://github.com/node-opcua/node-opcua/releases/tag/v2.166.0"}, {"source": "security-advisories@github.com", "url": "https://github.com/node-opcua/node-opcua/security/advisories/GHSA-6wvw-vrw4-363w"}], "sourceIdentifier": "security-advisories@github.com", "vulnStatus": "Awaiting Analysis", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-770"}], "source": "security-advisories@github.com", "type": "Primary"}]}

{}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[0,2.166.0)"}}], "enrichment": {"confidence": 84.0, "confidence_source": "matching", "scores": [{"score": 84.0, "source": "matching"}]}, "original": {"product": "node-opcua", "source": "cna", "vendor": "node-opcua"}, "product": "node-opcua", "vendor": "node-opcua_project"}], "created": "2026-09-15T13:15:18.957137+00:00", "updated": "2026-09-21T00:00:08.084402+00:00", "vendors": ["node-opcua_project", "node-opcua_project$PRODUCT$node-opcua"]}