by Kastro
Paper/Archive/CVE-2026-116014

CVE-2026-116014

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

EPSS 0.4%CVSS 9.2
critical.is priorityof 100
35
CVSS 9.2 (CNA)9.2 / 10 × 3027.6Not in CISA KEV+300.0EPSS percentile 37.4.374 × 207.5No public exploit+100.0SSVC exploitation: none+100.0
Description · from the CVE record

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.

Affected

ProductAffectedFixed inSource
open625411.5.0 – < 1.5.71.5.7CNA

Scores by source

VulnCheck (CNA)9.2CVSS: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 (CNA)8.1CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
CISA ADPSSVCExploitation: none · Automatable: no · Technical impact: total

References

patchgithub.com/open62541/open62541/pull/8298patchgithub.com/open62541/open62541/commit/0cf4806768c493bc6ccffcd4419da24153b970ecpatchgithub.com/open62541/open62541/pull/8302writeupgithub.com/open62541/open62541/blob/v1.5.6/src/ua_types_definition.c#L274refgithub.com/open62541/open62541/releases/tag/v1.5.7writeupvulncheck.com/advisories/open62541-1.5.0-before-1.5.7-integer-overflow-heap-buffer-overflow-via-custom-datatype