CVE-2026-67857

Severity CVSS v4.0:

Pending analysis

Type:

CWE-125 Out-of-bounds Read

Publication date:

04/08/2026

Last modified:

05/08/2026

Description

open62541 1.5.5 contains an out-of-bounds read in the client-side function responseReadNamespacesArray() in src/client/ua_client_connect.c.

Impact

Vector 3.x

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H CVSS v3.1 Severity and Metrics:

Base Score: 7.50 HIGH
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Attack Vector (AV): Network
Attack Complexity (AC): Low
Privileges Required (PR): None
User Interaction (UI): None
Scope (S): Unchanged
Confidentiality (C): None
Integrity (I): None
Availability (A): High

Base Score 3.x

7.50

Severity 3.x

HIGH

References to Advisories, Solutions, and Tools

https://github.com/gff-cw/information/issues/9
https://github.com/open62541/open62541/blob/v1.5.5/examples/client_connect.c
https://github.com/open62541/open62541/blob/v1.5.5/examples/client_connect_loop.c
https://github.com/open62541/open62541/blob/v1.5.5/src/client/ua_client_connect.c
https://github.com/open62541/open62541/issues/8104
https://github.com/open62541/open62541/issues/8104