CVE-2026-116014
open62541 1.5.0 before 1.5.7 Integer Overflow Heap Buffer Overflow via Custom DataType
- State
- Published
- Severity
- 9.2 Critical
- Published
- Oct 24, 2026
- Updated
- Oct 29, 2026
- Reserved
- Oct 24, 2026
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.
Scores
| CVSS | Score | Vector | Source |
|---|---|---|---|
| 4.0 | 9.2 Critical | 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 | VulnCheck |
| 3.1 | 8.1 High | CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H | VulnCheck |
Weaknesses
- CWE-190 Integer Overflow or Wraparound
Affected Products
| Product | Versions |
|---|---|
open62541open62541 |
|
References
- https://github.com/open62541/open62541/commit/0cf4806768c493bc6ccffcd4419da24153b970ecpatch
- https://github.com/open62541/open62541/pull/8298patchissue-tracking
- https://github.com/open62541/open62541/pull/8302patchissue-tracking
- https://github.com/open62541/open62541/blob/v1.5.6/src/ua_types_definition.c#L274technical-description
- open62541 v1.5.7 Release Notesrelease-notes
- VulnCheck Advisory: open62541 1.5.0 before 1.5.7 Integer Overflow Heap Buffer Overflow via Custom DataTypethird-party-advisory
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