CVE-2026-67856

Severity CVSS v4.0:

Pending analysis

Type:

CWE-400 Uncontrolled Resource Consumption ('Resource Exhaustion')

Publication date:

04/08/2026

Last modified:

05/08/2026

Description

An issue in open62541 v.1.5.5 and before allows a remote attacker to cause a denial of service via crafted CreateSubscription, CreateMonitoredItems(Sampling), Publish, TransferSubscriptions, and DeleteSubscriptions requests

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/open62541/open62541/blob/master/examples/access_control/server_access_control.c
https://github.com/open62541/open62541/blob/master/src/server/ua_services_subscription.c
https://github.com/open62541/open62541/blob/master/src/server/ua_subscription.c
https://github.com/open62541/open62541/blob/master/src/server/ua_subscription.h
https://github.com/open62541/open62541/issues/8092
https://github.com/open62541/open62541/issues/8092