{"id":"CVE-2026-116014","url":"https://www.cyber-defence.io/tools/cve/CVE-2026-116014","generatedAt":"2026-10-28T03:58:06.647Z","title":"open62541 1.5.0 before 1.5.7 contains an integer overflow in UA_DataType_fromStructureDescription() that wraps the 16-bit memSize field for large custom structure definitions.","description":"open62541 1.5.0 before 1.5.7 contains an integer overflow in UA_DataType_fromStructureDescription() that wraps the 16-bit memSize field for large custom structure definitions. A malicious OPC UA server can supply DataType definitions via UA_Client_getRemoteDataTypes(), causing decodeBinaryStructure() to overflow the heap, crashing clients or enabling code execution.","published":"2026-10-24T12:16:58.000Z","lastModified":"2026-10-26T18:39:43.000Z","status":"Awaiting Analysis","sourceIdentifier":"disclosure@vulncheck.com","cvss":{"version":"4.0","score":9.2,"severity":"CRITICAL","vector":"CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/M"},"cwe":["CWE-190"],"affected":[],"epss":{"score":0.00432,"percentile":0.37236,"date":"2026-10-27","history":[{"date":"2026-10-25","score":0.00432,"percentile":0.37139}]},"kev":{"listed":false},"exploits":{"count":0,"verified":false,"firstPublished":null,"source":"Exploit-DB (https://gitlab.com/exploit-database/exploitdb)","entries":[]},"verdict":{"level":"high","text":"High impact if exploited, but EPSS currently rates exploitation as unlikely (0.43%). Schedule it in the normal patch cycle and watch for a rise in EPSS or a public exploit."},"changes":[{"kind":"new","label":"New CVE","at":"2026-10-24T12:16:58.000Z","detail":{"score":"9.2","severity":"CRITICAL","publishedAt":"2026-10-24T12:16:57.607Z"},"summary":"New CVE, critical severity (CVSS 9.2)."}],"references":[{"url":"https://github.com/open62541/open62541/blob/v1.5.6/src/ua_types_definition.c#L274","source":"disclosure@vulncheck.com"},{"url":"https://github.com/open62541/open62541/commit/0cf4806768c493bc6ccffcd4419da24153b970ec","source":"disclosure@vulncheck.com"},{"url":"https://github.com/open62541/open62541/pull/8298","source":"disclosure@vulncheck.com"},{"url":"https://github.com/open62541/open62541/pull/8302","source":"disclosure@vulncheck.com"},{"url":"https://github.com/open62541/open62541/releases/tag/v1.5.7","source":"disclosure@vulncheck.com"},{"url":"https://www.vulncheck.com/advisories/open62541-1.5.0-before-1.5.7-integer-overflow-heap-buffer-overflow-via-custom-datatype","source":"disclosure@vulncheck.com"}],"sources":{"nvd":"https://nvd.nist.gov/vuln/detail/CVE-2026-116014","epss":"https://www.first.org/epss/","kev":"https://www.cisa.gov/known-exploited-vulnerabilities-catalog","exploitdb":"https://www.exploit-db.com/"},"licence":"CC BY 4.0 — link back to the CVE Explorer if you publish the results; upstream data remains subject to its own terms."}