CVE-2026-67856

ANALYSIS PENDING

open62541 < 1.5.6 - Denial of Service via Crafted OPC UA Subscription Requests

Title source: llm

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 (5)

Core 5

Core References

https://github.com/open62541/open62541/issues/8092

https://github.com/open62541/open62541/blob/master/src/server/ua_services_subscription.c

View Writeup ZIP pw:eip

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/blob/master/examples/access_control/server_access_control.c

Scores

EPSS 0.0042

EPSS Percentile 34.8%

CISA SSVC

Vulnrichment

Exploitation poc

Automatable yes

Technical Impact partial

Details

Status published

Published Aug 04, 2026

Tracked Since Aug 05, 2026