CVE-2026-116014 open62541 - Integer Overflow

open62541 < 1.5.7 contains an integer overflow caused by improper handling of the 16-bit memSize field in UA_DataType_fromStructureDescription(), letting malicious OPC UA servers cause heap overflow and potential code execution, exploit requires interaction with a malicious server.

CVSS base score 8.1 /10
High
CISA KEV
Not listed
Public exploit
None known
EPSS
0.43% chance of exploitation in 30 days
View the NVD record ↗

Details

Type
Integer Overflow
Impact
Remote Code Execution, Denial Of Service
CVSS vector
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
Published
24 October 2026
Updated
26 October 2026
Weakness
CWE-190

Vendor fix

Upgrade to version 1.5.7 or later.

Patching closes this CVE. It does not tell you which of your systems run the affected version, or what else is exposed alongside them.

References

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