CVE-2026-67856: n/a
A denial of service vulnerability exists in open62541 version 1.5.5 and earlier. Remote attackers can exploit this issue by sending specially crafted OPC UA service requests such as CreateSubscription, CreateMonitoredItems (Sampling), Publish, TransferSubscriptions, and DeleteSubscriptions. This leads to resource exhaustion or application disruption without requiring authentication.
AI Analysis
Technical Summary
CVE-2026-67856 is a denial of service vulnerability affecting open62541 versions up to and including 1.5.5. The flaw allows unauthenticated remote attackers to cause a denial of service by sending crafted OPC UA service requests related to subscription and monitored item management. The vulnerability is classified under CWE-400 (Uncontrolled Resource Consumption). No official patch or remediation guidance has been published at this time.
Potential Impact
Successful exploitation results in denial of service, causing the affected open62541 server or client to become unresponsive or crash. There is no impact on confidentiality or integrity, only availability is affected.
Mitigation Recommendations
Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Until a fix is available, consider limiting exposure of the OPC UA service to untrusted networks and monitoring for abnormal request patterns targeting subscription management services.
CVE-2026-67856: n/a
Description
A denial of service vulnerability exists in open62541 version 1.5.5 and earlier. Remote attackers can exploit this issue by sending specially crafted OPC UA service requests such as CreateSubscription, CreateMonitoredItems (Sampling), Publish, TransferSubscriptions, and DeleteSubscriptions. This leads to resource exhaustion or application disruption without requiring authentication.
CVSS v3.1
Score 7.5high
Affected software
pkg:github/open62541/open62541Run on your own infrastructure? Check whether these packages are installed with threat-finder — our free open-source scanner.
Weaknesses
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
CVE-2026-67856 is a denial of service vulnerability affecting open62541 versions up to and including 1.5.5. The flaw allows unauthenticated remote attackers to cause a denial of service by sending crafted OPC UA service requests related to subscription and monitored item management. The vulnerability is classified under CWE-400 (Uncontrolled Resource Consumption). No official patch or remediation guidance has been published at this time.
Potential Impact
Successful exploitation results in denial of service, causing the affected open62541 server or client to become unresponsive or crash. There is no impact on confidentiality or integrity, only availability is affected.
Mitigation Recommendations
Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Until a fix is available, consider limiting exposure of the OPC UA service to untrusted networks and monitoring for abnormal request patterns targeting subscription management services.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- mitre
- Date Reserved
- 2026-07-30T00:00:00.000Z
- State
- PUBLISHED
Threat ID: 6a725cbabf8831d5398274d4
Added to database: 08/04/2026, 21:42:18 UTC
Last enriched: 08/12/2026, 15:12:52 UTC
Last updated: 09/17/2026, 22:01:37 UTC
Views: 58
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