{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-18784", "assignerOrgId": "1af790b2-7ee1-4545-860a-a788eba489b5", "state": "PUBLISHED", "assignerShortName": "VulDB", "dateReserved": "2026-08-04T08:29:59.828Z", "datePublished": "2026-08-04T16:30:09.771Z", "dateUpdated": "2026-08-04T16:30:09.771Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "1af790b2-7ee1-4545-860a-a788eba489b5", "shortName": "VulDB", "dateUpdated": "2026-08-04T16:30:09.771Z"}, "title": "o6 open62541 ua_client_highlevel.c UA_Client_readNodeClassAttribute heap-based overflow", "problemTypes": [{"descriptions": [{"type": "CWE", "cweId": "CWE-122", "lang": "en", "description": "Heap-based Buffer Overflow"}]}, {"descriptions": [{"type": "CWE", "cweId": "CWE-119", "lang": "en", "description": "Memory Corruption"}]}], "affected": [{"vendor": "o6", "product": "open62541", "versions": [{"version": "1.5.0", "status": "affected"}, {"version": "1.5.1", "status": "affected"}, {"version": "1.5.2", "status": "affected"}, {"version": "1.5.3", "status": "affected"}, {"version": "1.5.4", "status": "affected"}, {"version": "1.5.5", "status": "affected"}], "cpes": ["cpe:2.3:a:open62541:open62541:*:*:*:*:*:*:*:*"]}], "descriptions": [{"lang": "en", "value": "A vulnerability was found in o6 open62541 up to 1.5.5. This issue affects the function UA_Client_readNodeClassAttribute of the file src/client/ua_client_highlevel.c. Performing a manipulation results in heap-based buffer overflow. Attacking locally is a requirement. The exploit has been made public and could be used. The project closed the issue report, stating that this is not the official way to report a security vulnerability."}], "metrics": [{"cvssV4_0": {"version": "4.0", "baseScore": 4.8, "vectorString": "CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N/E:P", "baseSeverity": "MEDIUM"}}, {"cvssV3_1": {"version": "3.1", "baseScore": 5.3, "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:L/E:P/RL:X/RC:R", "baseSeverity": "MEDIUM"}}, {"cvssV3_0": {"version": "3.0", "baseScore": 5.3, "vectorString": "CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:L/E:P/RL:X/RC:R", "baseSeverity": "MEDIUM"}}, {"cvssV2_0": {"version": "2.0", "baseScore": 4.3, "vectorString": "AV:L/AC:L/Au:S/C:P/I:P/A:P/E:POC/RL:ND/RC:UR"}}], "timeline": [{"time": "2026-08-04T00:00:00.000Z", "lang": "en", "value": "Advisory disclosed"}, {"time": "2026-08-04T02:00:00.000Z", "lang": "en", "value": "VulDB entry created"}, {"time": "2026-08-04T10:47:54.000Z", "lang": "en", "value": "VulDB entry last update"}], "credits": [{"lang": "en", "value": "Chuan Wei", "type": "finder"}, {"lang": "en", "value": "VULL (VulDB User)", "type": "reporter"}, {"lang": "en", "value": "SCU_1CP (VulDB User)", "type": "analyst"}, {"lang": "en", "value": "VulDB CNA Team", "type": "coordinator"}], "references": [{"url": "https://vuldb.com/vuln/385786", "name": "VDB-385786 | o6 open62541 ua_client_highlevel.c UA_Client_readNodeClassAttribute heap-based overflow", "tags": ["vdb-entry", "technical-description"]}, {"url": "https://vuldb.com/vuln/385786/cti", "name": "VDB-385786 | CTI Indicators (IOB, IOC, IOA)", "tags": ["signature", "permissions-required"]}, {"url": "https://vuldb.com/cve/CVE-2026-18784", "name": "CVE-2026-18784 | CVE Analysis and Report", "tags": ["third-party-advisory"]}, {"url": "https://vuldb.com/submit/857012", "name": "Submit #857012 | open62541 Project open62541 master (commit ca356b088ada7dee824d1b4acd07c1ff07ce242b) Heap-based Buffer Overflow (Out-of-Bounds Read)", "tags": ["third-party-advisory"]}, {"url": "https://github.com/open62541/open62541/issues/8139", "tags": ["issue-tracking"]}, {"url": "https://github.com/gff-cw/information/issues/11", "tags": ["exploit", "issue-tracking"]}], "x_generator": ["VulDB PVTS v202608"]}}}

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{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "1.5.0"}}, {"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "1.5.1"}}, {"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "1.5.2"}}, {"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "1.5.3"}}, {"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "1.5.4"}}, {"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "1.5.5"}}], "enrichment": {"confidence": 95.0, "confidence_source": "inferred", "scores": [{"score": 95.0, "source": "inferred"}, {"score": 100.0, "source": "matching"}]}, "original": {"product": "open62541", "source": "cna", "vendor": "o6"}, "product": "open62541", "vendor": "open62541"}], "created": "2026-08-04T18:45:12.463301+00:00", "title": "Heap-based Buffer Overflow in open62541 Client Read NodeClass Attribute", "updated": "2026-08-04T19:30:05.434481+00:00", "vendors": ["open62541", "open62541$PRODUCT$open62541"]}