{"id":"CVE-2026-116014","title":"open62541 1.5.0 before 1.5.7 Integer Overflow Heap Buffer Overflow via Custom DataType","summary":"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…","severity":"high","cvss":8.1,"cvssVector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H","cvssSource":"cna","cwe":["CWE-190"],"vendor":"open62541","product":"open62541","affected":["open62541 >= 1.5.0 < 1.5.7"],"published":"2026-10-24","updated":"2026-10-24","sourceUpdated":"2026-10-24T11:40:32.200Z","source":"CVEORG","sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-116014","references":[{"url":"https://github.com/open62541/open62541/commit/0cf4806768c493bc6ccffcd4419da24153b970ec"},{"url":"https://github.com/open62541/open62541/pull/8298"},{"url":"https://github.com/open62541/open62541/pull/8302"},{"url":"https://github.com/open62541/open62541/blob/v1.5.6/src/ua_types_definition.c#L274"},{"url":"https://github.com/open62541/open62541/releases/tag/v1.5.7","label":"open62541 v1.5.7 Release Notes"},{"url":"https://www.vulncheck.com/advisories/open62541-1.5.0-before-1.5.7-integer-overflow-heap-buffer-overflow-via-custom-datatype","label":"VulnCheck Advisory: open62541 1.5.0 before 1.5.7 Integer Overflow Heap Buffer Overflow via Custom DataType"}],"tags":["cve.org"],"ingestedAt":"2026-10-24T11:57:47.029Z","slug":"CVE-2026-116014","body":"## Overview\n\nopen62541 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.\n\n## Affected\n\n- `open62541 >= 1.5.0 < 1.5.7`\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"twilight","depthScore":45,"depthScoreParts":{"impact":44.6,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[]}