Bug 2511510

Summary: CVE-2026-67856 open62541: open62541: Denial of Service via crafted subscription requests [fedora-all]
Product: [Fedora] Fedora Reporter: Marian Rehak <mrehak>
Component: open62541Assignee: Jens Reimann <jreimann>
Status: CLOSED ERRATA QA Contact: Fedora Extras Quality Assurance <extras-qa>
Severity: high Docs Contact:
Priority: high    
Version: 45CC: jreimann, thofmann
Target Milestone: ---Keywords: Security, SecurityTracking
Target Release: ---   
Hardware: Unspecified   
OS: Unspecified   
Whiteboard: {"flaws": ["8959a35e-9867-4cc4-9ef9-9a0ca167abcd"]}
Fixed In Version: open62541-1.5.8-1.fc45 open62541-1.5.8-1.fc44 open62541-1.5.8-1.fc43 Doc Type: ---
Doc Text:
Story Points: ---
Clone Of: Environment:
Last Closed: 2026-09-17 00:16:04 UTC Type: ---
Regression: --- Mount Type: ---
Documentation: --- CRM:
Verified Versions: Category: ---
oVirt Team: --- RHEL 7.3 requirements from Atomic Host:
Cloudforms Team: --- Target Upstream Version:
Embargoed:
Bug Depends On:    
Bug Blocks: 2511267    

Description Marian Rehak 2026-08-05 13:00:54 UTC
Disclaimer: Community trackers are created by Red Hat Product Security team on a best effort basis. Package maintainers are required to ascertain if the flaw indeed affects their package, before starting the update process.

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

Comment 1 Aoife Moloney 2026-08-17 15:46:58 UTC
This bug appears to have been reported against 'rawhide' during the Fedora Linux 45 development cycle.
Changing version to 45.

Comment 2 Fedora Update System 2026-09-08 08:01:50 UTC
FEDORA-2026-8cbd9e2c8b (open62541-1.5.8-1.fc43) has been submitted as an update to Fedora 43.
https://bodhi.fedoraproject.org/updates/FEDORA-2026-8cbd9e2c8b

Comment 3 Fedora Update System 2026-09-09 00:53:33 UTC
FEDORA-2026-3fd073ad5b has been pushed to the Fedora 45 testing repository.
Soon you'll be able to install the update with the following command:
`sudo dnf upgrade --enablerepo=updates-testing --refresh --advisory=FEDORA-2026-3fd073ad5b`
You can provide feedback for this update here: https://bodhi.fedoraproject.org/updates/FEDORA-2026-3fd073ad5b

See also https://fedoraproject.org/wiki/QA:Updates_Testing for more information on how to test updates.

Comment 4 Fedora Update System 2026-09-09 04:35:28 UTC
FEDORA-2026-8cbd9e2c8b has been pushed to the Fedora 43 testing repository.
Soon you'll be able to install the update with the following command:
`sudo dnf upgrade --enablerepo=updates-testing --refresh --advisory=FEDORA-2026-8cbd9e2c8b`
You can provide feedback for this update here: https://bodhi.fedoraproject.org/updates/FEDORA-2026-8cbd9e2c8b

See also https://fedoraproject.org/wiki/QA:Updates_Testing for more information on how to test updates.

Comment 5 Fedora Update System 2026-09-09 05:04:54 UTC
FEDORA-2026-6d919ea521 has been pushed to the Fedora 44 testing repository.
Soon you'll be able to install the update with the following command:
`sudo dnf upgrade --enablerepo=updates-testing --refresh --advisory=FEDORA-2026-6d919ea521`
You can provide feedback for this update here: https://bodhi.fedoraproject.org/updates/FEDORA-2026-6d919ea521

See also https://fedoraproject.org/wiki/QA:Updates_Testing for more information on how to test updates.

Comment 6 Fedora Update System 2026-09-17 00:16:04 UTC
FEDORA-2026-3fd073ad5b (open62541-1.5.8-1.fc45) has been pushed to the Fedora 45 stable repository.
If problem still persists, please make note of it in this bug report.

Comment 7 Fedora Update System 2026-09-17 00:51:53 UTC
FEDORA-2026-6d919ea521 (open62541-1.5.8-1.fc44) has been pushed to the Fedora 44 stable repository.
If problem still persists, please make note of it in this bug report.

Comment 8 Fedora Update System 2026-09-17 01:05:53 UTC
FEDORA-2026-8cbd9e2c8b (open62541-1.5.8-1.fc43) has been pushed to the Fedora 43 stable repository.
If problem still persists, please make note of it in this bug report.