{"id":"CVE-2026-116014","state":"PUBLISHED","title":"open62541 1.5.0 before 1.5.7 Integer Overflow Heap Buffer Overflow via Custom DataType","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.","publishedAt":"2026-10-24T11:40:32.200Z","updatedAt":"2026-10-29T16:08:24.942Z","severity":{"score":9.2,"label":"Critical","version":"4.0","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","source":"VulnCheck"},"assigner":"VulnCheck","products":["open62541 open62541"],"affected":[{"vendor":"open62541","product":"open62541","packageURL":"pkg:github/open62541/open62541","defaultStatus":"unaffected","versions":[{"version":"1.5.0","status":"affected","lessThan":"1.5.7","versionType":"semver"}],"repo":"https://github.com/open62541/open62541"}],"references":["https://github.com/open62541/open62541/commit/0cf4806768c493bc6ccffcd4419da24153b970ec","https://github.com/open62541/open62541/pull/8298","https://github.com/open62541/open62541/pull/8302","https://github.com/open62541/open62541/blob/v1.5.6/src/ua_types_definition.c#L274","https://github.com/open62541/open62541/releases/tag/v1.5.7","https://www.vulncheck.com/advisories/open62541-1.5.0-before-1.5.7-integer-overflow-heap-buffer-overflow-via-custom-datatype"],"weaknesses":["CWE-190"],"ingestedAt":"2026-10-29T20:10:43.281Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/116xxx/CVE-2026-116014.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-116014","state":"PUBLISHED","datePublished":"2026-10-24T11:40:32.200Z","dateUpdated":"2026-10-29T16:08:24.942Z","assignerShortName":"VulnCheck","assignerOrgId":"83251b91-4cc7-4094-a5c7-464a1b83ea10","dateReserved":"2026-10-24T11:23:55.329Z"},"containers":{"cna":{"title":"open62541 1.5.0 before 1.5.7 Integer Overflow Heap Buffer Overflow via Custom DataType","descriptions":[{"lang":"en","value":"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. 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