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.
Fix
Nothing published yet: no patch, vendor advisory or mitigation reference on NVD, no vendor advisory in the News for this CVE, not in CISA's KEV, no fixed package version. BaselineWatch does not guess at one.
Change history 3
- StatusPublished → Awaiting AnalysisNVD modified 2026-10-26 18:39
- StatusReceived → PublishedNVD modified 2026-10-24 11:40
- First seenCVSS 9.2NVD modified 2026-10-24 12:16
Affected (CPE criteria) 0
NVD has not attached CPE configurations yet.
References 6
- https://github.com/open62541/open62541/blob/v1.5.6/src/ua_types_definition.c#L274
- 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/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