CVE-2026-116014
open62541 1.5.0 before 1.5.7 Integer Overflow Heap Buffer Overflow via Custom DataType
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CVSS v3.1 (listed by NVD)
8.1
HIGH
Scored by vulncheck.com (not yet scored by NVD)
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
CVSS v4.0 (listed by NVD)
9.2
CRITICAL
Scored by vulncheck.com (not yet scored by NVD)
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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
CVSS (listed by CVE.org)
9.2
CRITICAL
Scored by CNA (VulnCheck) · v4.0
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
EPSS exploit probability
—
Not computed
CISA KEV
—
Not listed
Attack conditions and impact
Derived from the CNA (via NVD) CVSS 3.1 vector
NetworkNo authNo interactionConditions
Confidentiality HIntegrity HAvailability H
This vulnerability may be exploitable over the internet without authentication or user interaction.
| Metric | Value | Meaning |
|---|---|---|
| Attack vector AV | N | Network |
| Attack complexity AC | H | High (conditions required) |
| Privileges required PR | N | None |
| User interaction UI | N | None |
| Scope S | U | Unchanged |
| Confidentiality C | H | High |
| Integrity I | H | High |
| Availability A | H | High |
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
Description
NVD
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 assessments
| Provider | Version | Score | Vector |
|---|---|---|---|
| NVD / [email protected] (Secondary) | 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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X |
| NVD / [email protected] (Primary) | 3.1 | 8.1 HIGH | CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H |
| CNA / VulnCheck | 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 |
| CNA / 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 |
Affected products and packages
CNA (CVE.org)
| Vendor | Product | Versions |
|---|---|---|
| open62541 | open62541 | affected: 1.5.0 … < 1.5.7 default: unaffected |
Linux distribution status
References (6)
- https://github.com/open62541/open62541/blob/v1.5.6/src/ua_types_definition.c#L274 NVD, CNA technical-description
- https://github.com/open62541/open62541/commit/0cf4806768c493bc6ccffcd4419da24153b970ec NVD, CNA patch
- https://github.com/open62541/open62541/pull/8298 NVD, CNA patchissue-tracking
- https://github.com/open62541/open62541/pull/8302 NVD, CNA patchissue-tracking
- https://github.com/open62541/open62541/releases/tag/v1.5.7 NVD, CNA release-notes
- https://www.vulncheck.com/advisories/open62541-1.5.0-before-1.5.7-integer-overflow-heap-buffer-overflow-via-custom-datatype NVD, CNA third-party-advisory