{"id":"CVE-2026-54156","state":"PUBLISHED","title":"node-opcua: Unbounded nonce cache enables unauthenticated heap exhaustion DoS","description":"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.","publishedAt":"2026-09-14T16:09:07.744Z","updatedAt":"2026-09-14T16:35:48.958Z","severity":{"score":7.5,"label":"High","version":"3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","source":"GitHub_M"},"assigner":"GitHub_M","products":["node-opcua node-opcua"],"affected":[{"vendor":"node-opcua","product":"node-opcua","versions":[{"version":"< 2.166.0","status":"affected"}]}],"references":["https://github.com/node-opcua/node-opcua/security/advisories/GHSA-6wvw-vrw4-363w","https://github.com/node-opcua/node-opcua/commit/b82c2939fe9c658de58da993f2798ec5481d7313","https://github.com/node-opcua/node-opcua/releases/tag/v2.166.0"],"weaknesses":["CWE-770"],"ingestedAt":"2026-10-29T20:12:24.861Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/54xxx/CVE-2026-54156.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-54156","state":"PUBLISHED","datePublished":"2026-09-14T16:09:07.744Z","dateUpdated":"2026-09-14T16:35:48.958Z","assignerShortName":"GitHub_M","assignerOrgId":"a0819718-46f1-4df5-94e2-005712e83aaa","dateReserved":"2026-06-11T21:15:33.872Z"},"containers":{"cna":{"title":"node-opcua: Unbounded nonce cache enables unauthenticated heap exhaustion DoS","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."}],"affected":[{"vendor":"node-opcua","product":"node-opcua","versions":[{"version":"< 2.166.0","status":"affected"}]}],"references":[{"url":"https://github.com/node-opcua/node-opcua/security/advisories/GHSA-6wvw-vrw4-363w","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/commit/b82c2939fe9c658de58da993f2798ec5481d7313","name":"https://github.com/node-opcua/node-opcua/commit/b82c2939fe9c658de58da993f2798ec5481d7313","tags":["x_refsource_MISC"]},{"url":"https://github.com/node-opcua/node-opcua/releases/tag/v2.166.0","name":"https://github.com/node-opcua/node-opcua/releases/tag/v2.166.0","tags":["x_refsource_MISC"]}],"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"}}],"problemTypes":[{"descriptions":[{"cweId":"CWE-770","lang":"en","description":"CWE-770: Allocation of Resources Without Limits or Throttling","type":"CWE"}]}],"providerMetadata":{"shortName":"GitHub_M","orgId":"a0819718-46f1-4df5-94e2-005712e83aaa","dateUpdated":"2026-09-14T16:09:07.744Z"},"source":{"advisory":"GHSA-6wvw-vrw4-363w","discovery":"UNKNOWN"}},"adp":[{"title":"CISA ADP Vulnrichment","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"}}}],"providerMetadata":{"shortName":"CISA-ADP","orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","dateUpdated":"2026-09-14T16:35:48.958Z"}}]}}}