CVE-2026-116014 PUBLISHED

open62541 1.5.0 before 1.5.7 Integer Overflow Heap Buffer Overflow via Custom DataType

Assigner: VulnCheck
Reserved: 24.10.2026 Published: 24.10.2026 Updated: 24.10.2026

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.

CVSS 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
CVSS Score: 9.2

Exploitability Metrics		Vulnerable System Impact Metrics		Subsequent System Impact Metrics
Attack Vector	Network	Confidentiality	High	Confidentiality	None
Attack Complexity	Low	Integrity	High	Integrity	None
Attack Requirements	Present	Availability	High	Availability	None
Privileges Required	None
User Interaction	None

CVSS 4.0

CVSS Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
CVSS Score: 8.1

Attack Vector	Network	Scope	Unchanged
Attack Complexity	High	Confidentiality Impact	High
Privileges Required	None	Integrity Impact	High
User Interaction	None	Availability Impact	High

CVSS 3.1

Product Status

Vendor	open62541
Product	open62541
Versions	Default: unaffected affected from 1.5.0 to 1.5.7 (excl.)

CVE-2026-116014 PUBLISHED

open62541 1.5.0 before 1.5.7 Integer Overflow Heap Buffer Overflow via Custom DataType

Metrics

Product Status

Credits

References

Problem Types