{"items":[{"id":"NVI-00013917","kind":"vulnerability","title":"node-opcua: Unbounded nonce cache enables unauthenticated heap exhaustion DoS","revision":2,"unknowns":["Customer inventory, deployment, reachability and exploitation have not been inspected.","NVD lastModified does not establish freshness of every associated CPE record."],"lifecycle":"active","identifiers":["GHSA-6wvw-vrw4-363w","CVE-2026-54156"],"plain_summary":"GitHub lists this reviewed advisory for node-opcua. Published version ranges and source prerequisites are shown below; this is not an inspection of a visitor’s application.","review_status":"source_listed","control_topics":[],"public_actions":[{"summary":"Identify the exact component and deployed version, examine the linked publisher’s conditions, and retain evidence of any mitigation.","source_ids":["sr-0b8b71d83b575c780f2b99bed4af83e6"],"action_type":"investigate","limitations":"Confirm current vendor support, compatibility and deployment evidence. This report has not tested a fix in your system.","current_supported_target":null}],"schema_version":"1.1.0","source_metrics":[{"kind":"CVSS","as_of":"2026-08-27T19:04:43.000Z","value":"7.5 high","meaning":"GitHub source severity; exploitability and local consequence require separate evidence.","source_id":"sr-1d5d102b73c63937abb1b9cb5f190e2e"},{"kind":"CVSS","as_of":"2026-09-30T19:38:27.293Z","value":"7.5 HIGH (3.1)","meaning":"security-advisories@github.com severity; no combined Null risk score.","source_id":"sr-0b8b71d83b575c780f2b99bed4af83e6"}],"why_it_matters":"Published affected context helps an owner decide what evidence to gather. This report has not examined your application.","related_sources":[{"id":"sr-1d5d102b73c63937abb1b9cb5f190e2e","url":"https://github.com/advisories/GHSA-6wvw-vrw4-363w","basis":"vendor_advisory","notes":"GitHub Advisory Database; CC-BY-4.0. Each advisory links its original attribution. Null normalizes fields.","title":"GHSA-6wvw-vrw4-363w","publisher":"GitHub Advisory Database","observed_at":"2026-11-02T09:56:23.004Z"},{"id":"sr-0b8b71d83b575c780f2b99bed4af83e6","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-54156","basis":"official_catalog","notes":"This product uses data from the NVD API but is not endorsed or certified by the NVD.","title":"CVE-2026-54156","publisher":"NIST National Vulnerability Database","observed_at":"2026-11-08T01:48:12.360Z"}],"affected_context":[{"certainty":"source_listed","source_ids":["sr-1d5d102b73c63937abb1b9cb5f190e2e"],"technology":"node-opcua","known_exclusions":[],"conditions_summary":"**Summary**\nA process-global nonce cache with no eviction policy allows an unauthenticated remote attacker to exhaust server heap memory by repeatedly opening sessions, causing the node-opcua server process to crash.\n\n**Affected versions:** <= 2.165.0\n**Tested version:** 2.165.0\n**CVSS Score:** 7.5 (High)\n**CVSS Vector:** CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H\n**CWE:** CWE-770 Allocation of Resources Without Limits or Throttling\n\n---\n\n**Root Cause**\n\nIn `packages/node-opcua-secure-channel/source/server/server_secure_channel_layer.ts` at line 156, `g_alreadyUsedNonce` is a process-global object used to track previously seen nonces for replay detection. Entries are added on every `OpenSecureChannelRequest` and every `CreateSession` request but are never removed or expired.\n\nAn unauthenticated attacker can exploit the `CreateSession` path (which requires no certificate) to accumulate nonce entries indefinitely. Even with `maxSessions=10` limiting concurrent sessions, nonces persist after session expiry, allowing slow but reliable heap exhaustion across repeated connection cycles.\n\n---\n\n**Measured Impact**\n\nDynamically confirmed heap growth:\n- 5,000 unique nonces → +1.23 MB resid","public_affected_ranges":["< 2.166.0"]}],"null_published_at":"2026-11-08T19:53:44.022Z","source_updated_at":"2026-08-27T19:04:43.000Z","source_disclosed_at":"2026-08-20T18:35:41.000Z","is_synthetic_fixture":false,"null_last_reviewed_at":null,"public_change_summary":"Source facts changed; compare the preserved prior revision.","null_first_observed_at":"2026-11-02T09:56:23.004Z"},{"id":"NVI-00013917","kind":"vulnerability","title":"node-opcua: Unbounded nonce cache enables unauthenticated heap exhaustion DoS","revision":1,"unknowns":["Customer inventory, deployment, reachability and exploitation have not been inspected."],"lifecycle":"active","identifiers":["GHSA-6wvw-vrw4-363w","CVE-2026-54156"],"plain_summary":"GitHub lists this reviewed advisory for node-opcua. Published version ranges and source prerequisites are shown below; this is not an inspection of a visitor’s application.","review_status":"source_listed","control_topics":[],"public_actions":[{"summary":"Identify the exact component and deployed version, examine the linked publisher’s conditions, and retain evidence of any mitigation.","source_ids":["sr-1d5d102b73c63937abb1b9cb5f190e2e"],"action_type":"investigate","limitations":"Confirm current vendor support, compatibility and deployment evidence. This report has not tested a fix in your system.","current_supported_target":null}],"schema_version":"1.1.0","source_metrics":[{"kind":"CVSS","as_of":"2026-08-27T19:04:43.000Z","value":"7.5 high","meaning":"GitHub source severity; exploitability and local consequence require separate evidence.","source_id":"sr-1d5d102b73c63937abb1b9cb5f190e2e"}],"why_it_matters":"Published affected context helps an owner decide what evidence to gather. This report has not examined your application.","related_sources":[{"id":"sr-1d5d102b73c63937abb1b9cb5f190e2e","url":"https://github.com/advisories/GHSA-6wvw-vrw4-363w","basis":"vendor_advisory","notes":"GitHub Advisory Database; CC-BY-4.0. Each advisory links its original attribution. Null normalizes fields.","title":"GHSA-6wvw-vrw4-363w","publisher":"GitHub Advisory Database","observed_at":"2026-11-02T09:56:23.004Z"}],"affected_context":[{"certainty":"source_listed","source_ids":["sr-1d5d102b73c63937abb1b9cb5f190e2e"],"technology":"node-opcua","known_exclusions":[],"conditions_summary":"**Summary**\nA process-global nonce cache with no eviction policy allows an unauthenticated remote attacker to exhaust server heap memory by repeatedly opening sessions, causing the node-opcua server process to crash.\n\n**Affected versions:** <= 2.165.0\n**Tested version:** 2.165.0\n**CVSS Score:** 7.5 (High)\n**CVSS Vector:** CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H\n**CWE:** CWE-770 Allocation of Resources Without Limits or Throttling\n\n---\n\n**Root Cause**\n\nIn `packages/node-opcua-secure-channel/source/server/server_secure_channel_layer.ts` at line 156, `g_alreadyUsedNonce` is a process-global object used to track previously seen nonces for replay detection. Entries are added on every `OpenSecureChannelRequest` and every `CreateSession` request but are never removed or expired.\n\nAn unauthenticated attacker can exploit the `CreateSession` path (which requires no certificate) to accumulate nonce entries indefinitely. Even with `maxSessions=10` limiting concurrent sessions, nonces persist after session expiry, allowing slow but reliable heap exhaustion across repeated connection cycles.\n\n---\n\n**Measured Impact**\n\nDynamically confirmed heap growth:\n- 5,000 unique nonces → +1.23 MB resid","public_affected_ranges":["< 2.166.0"]}],"null_published_at":"2026-11-02T10:00:37.174Z","source_updated_at":"2026-08-27T19:04:43.000Z","source_disclosed_at":"2026-08-20T18:35:41.000Z","is_synthetic_fixture":false,"null_last_reviewed_at":null,"public_change_summary":"First indexed by Null; source disclosure date is shown separately.","null_first_observed_at":"2026-11-02T09:56:23.004Z"}],"next_cursor":null,"snapshot_revision":"42594"}