CVE-2026-67856
Medium
Elevated severity or exploit probability.
CVSS base
7.5
HIGH
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
EPSS — probability of exploitation (30 days)
0.8%
53.3th percentile
CISA KEV
Not listed
Weakness / dates
CWE-400
Published 2026-08-04 · modified 2026-08-31
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
References
- 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