CVE-2026-116014
open62541 1.5.0 before 1.5.7 contains an integer overflow in UA_DataType_fromStructureDescription()…
- Risk score
- 54/100
- CVSS
- 8.1 v3.1
- Published
- 24 Oct 2026
Open in the live forecast Today's forecast
What to know
- What it is
- 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 h…
- Affected
- See advisory
- Fix
- Upgrade the product to 1.5.7 or later.
- Exploitation
- No known exploitation
Why it is Yellow
- CVSS 8.1 high
- Remotely exploitable without logging in
References
- 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
Original 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.
Last activity 24 Oct 2026. Patch Forecast updates every hour.